Can someone please answer some of my questions?
*They are all math

In a case whereby a ball is thrown downward from the top of a 140​-foot building with an initial velocity of 16 feet per second. the time the ball is thrown will it strike the​ ground at t = 2.5 or -3.5.

Height of building = 140 ft

Initial velocity, u = 16 ft/sec

the equation given is

h = -16t² -16t +140

h(t) = -16t² -16t +140

AT h(t) = 0 , We can divide by -2 and have

(8t² + 8t - 70) = 0

8t² + 8t - 70 = 0

Then if we solve with quadratic equation formula where  a=8, b=8, c=- 70 then the root will be -7/2 and 5/2 then  t = 2.5 or -3.5

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complete question;

A ball is thrown downward from the top of a 140​-foot building with an initial velocity of 16 feet per second. the height of the ball h in feet after t seconds is given by the equation h equals negative 16 t squared minus 16 t plus 140. how long after the ball is thrown will it strike the​ ground?

Answer:

bottom lock: 30lb. top lock: 66

Step-by-step explanation:

the x=9 and the y=3 so do order of operations. (9x2)+(3x4), then 18+12=30. 30lb. is the first lock. then do (9x3)+9+30. the second lock is 66.

50 cm is the required perimeter of shape B.

A closed path that covers, encircles, or outlines a one-dimensional length or a two-dimensional shape is called a perimeter.

A circle's or an ellipse's circumference is referred to as its perimeter.

There are numerous uses in real life for perimeter calculations.

We must sum up the lengths of the rectangle's four sides in order to get its perimeter.

So, according to the given figures:

Shape A's circumference is 60 cm.

Let x cm be the length of each square.

The total length of shape A's free bounds is equal to 12x.

Consequently, 12x = 60.

x = 5 cm

Currently, the length surfaces of form B equal 10x.

Shape B's perimeter equals 10x.

= 10(5)

= 50 cm

Therefore, 50 cm is the required perimeter of shape B.

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Correct question:
Shape A and Shape B are each made from 5 identical squares.

The perimeter of shape A is 60cm. Work out the perimeter of Shape B

Answer:

i think they are unlike terms

Step-by-step explanation:

Answer:

Step-by-step explanation:

The two trains are moving apart from each other, so we can add their speeds to find their relative speed:

Relative speed = 75 + 95 = 170 miles per hour

We want to know how long it will take for the trains to be 204 miles apart. We can use the formula:

distance = rate × time

to solve for the time. Let t be the time in hours:

204 = 170t

Solving for t, we get:

t = 204/170

t ≈ 1.2 hours

Therefore, it will take approximately 1.2 hours for the two trains to be 204 miles apart.

Answer:

Trapezium or trapezoid

Answer:

About 40% I think-

Step-by-step explanation:

Basically, you change 2/5 into a percentage and you should get 40 percent.

The Wason selection test measures a person's ability to recognize information that challenges a certain hypothesis, in this case, a type of conditional hypothesis. if P, then Q.

Given,

Wason's Card;

A popular tool for studying problem resolution that was developed in 1966 by English psychologist Peter C(athcart) Wason (1924–2003). The uppermost faces of the four cards, which are arranged on a table, display the letters and numerals E, K, 4, and 7.

What is demonstrated by the Wason selection task?

As a result, the Wason selection test gauges how well people can spot evidence that refutes a certain hypothesis, in this case, a conditional hypothesis of the type. P, then Q if.

For example;-

The majority of people have no trouble choosing the proper cards ("16" and "drinking beer") if the rule is "If you are drinking alcohol, then you must be over 18" and the cards contain an age and beverage on one side, respectively.

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The function that models the above behavior is given as:

f(x) = ACos(B(x + C)) + 6 ..... .......i

where x = 1 (that is January)

D (Average Snowfall) = 6.

Hence, the amplitude (A) is given as:
A = 6-1

= 5

A mathematical function is a function comprising of different variables that    represent different factors or events and the relationships between them.

Recall that in a year we have 12 months. Hence, P = 12

→ P = (2π) /.B → (2π)/B = 12 → B = π/6

Taking the values of A and B and plugging them in, we ahve:

F(x) = 5 cos (π/6(x + C)) + 6................ii

This means that in July, we'll have

x = 7 and f(x) = 1

Therefore,

1 = 5cos ((π/6) (7 + C) + 6 → 5 Cos  ((π/6) (7 + C) →  -5cos ((π/6) (7 + C)

= -1

→   ((π/6) (7 + C) = π

→ 7 + C = 6

→ C = -1

Taking equation ii, we have

F(x) = 5cos ((π6) (x -1)) + 6

F (x) > 10

Therefore

5cos ((π/6) (x-1) + 6 > 10

→  cos ((π/6) (x-1) + 6 > 4/5

→  (π/6) (x-1)  > Cos⁻¹ (4/5)

(π/6) (x-1)  < 0.6435 and

(π/6) (x-1)  > 5.6397

→ x < 2.23 and x > 11.77

The interpretation is that upwards of ten inches of snow fall in January, February, November, and December.

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Answer:

Null/empty set

Step-by-step explanation:

The answer is null because neither Set C and D share the same numbers

\(\\ \sf\longmapsto 12x-15\)

Distributive property

Take 3 common

\(\\ \sf\longmapsto 3(4x-5)\)

Done

The quadratic function has two x-intercepts, which are approximately -2.54 and 0.54.

The standard form of the quadratic function is y = 3x² + 6x + 2.

To find the axis of symmetry, we can use the formula x = -b / 2a, where a = 3 and b = 6. Substituting these values, we get:

x = -6 / (2 x 3)

x = -1

Therefore, the axis of symmetry is x = -1.

To find the vertex, we need to substitute x = -1 in the given equation:

y = 3(-1)² + 6(-1) + 2

y = 3 - 6 + 2

y = -1

Therefore, the vertex is (-1, -1).

To find the x-intercepts, we can set y = 0 and solve for x:

0 = 3x² + 6x + 2

Using the quadratic formula, we get:

x = (-b ± √(b² - 4ac)) / 2a

Substituting a = 3, b = 6, and c = 2, we get:

x = (-6 ± √(6² - 4 x 3 x 2)) / 2 x 3

x = (-6 ± √12) / 6

x = (-6 ± 2√3) / 6

x = -1 ± (1/√3)

Therefore, the quadratic function has two x-intercepts, which are approximately -2.54 and 0.54.

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A mean of a normal distribution's upper bound of a 95% confidence interval is 58.11.

For the given question,

The confidence bound's upper limit (UCB) is determined as follows:

UCB =  μ + z(α/2)×σ/√n

Now, α/2 = (1 - 0.95)/2

α/2 = 0.025

z(α/2) = 1.96  (obtain from t-distribution table for degree of freedom)

Put the values in the formula,

UCB =  μ + z(α/2)×σ/√n

UCB = 36.96 + 1.96×41.8/√15

UCB = 58.11

As a result, 58.11 is the upper bound of a 95% confidence interval for the mean of a normal distribution.

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Answer:

4

Step-by-step explanation:

2+2=4

Answer:

Step-by-step explanation:

Possible number of sets:

Answer:

Hope this is helpful to you

∠A = ∠C for every isosceles triangle and not only for this specific isosceles triangle.

We are given that:

AB = BC

Now, draw a angle bisector from point B to the line AC in a way that it intersects AC at D.

Now, we get that:

∠ABD = ∠CBD ( BD is the angle bisector)

BD = BD ( common line)

So, ΔABD ≅ Δ CBD ( SAS property)

So,

∠A = ∠ C ( CPCT rule)

Also, it will be true for every isosceles triangle.

Therefore, we get that, ∠A = ∠C for every isosceles triangle and not only for this specific isosceles triangle.

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Your question was incomplete. Please refer the content below:

There is an isosceles triangle with AB = BC. Prove that ∠A = ∠C.

Did we prove the conclusion true for every isosceles triangle or only for this specific isosceles triangle.

the answer is six

I'm sure

Answer:

Step-by-step explanation:

slope formula: \(\frac{y_{2} -y_{1} }{x_{2}-x_{1} }\)

Points (–3, 3) and (18, 26)

\(\frac{26-3}{18-(-3)}\)  = \(\frac{23}{21}\)

I got it right on the test (ed)

Answer:

Step-by-step explanation:

First, write down your equations (wherein apples are represented by x and oranges by y)

8x + 7y = 18.85

2x + 10y = 12.88

From here, we will solve by substitution.

First, we will have to isolate a variable.

2x + 10y = 12.88         Subtract

2x = -10y + 12.88        Divide

x = -5y + 6.44

Now substitute

8 ( -5y + 6.44) + 7y = 18.85    Distribute

-40y + 51.52 + 7y = 18.85      Combine like terms

-33y = -32.67                         Solve

y = 0.99 or 99 cents per pound of oranges

Substitute once more to find x

2x + 9.90 = 12.88         Subtract

2x = 2.98                      Solve

x = 1.49 or $1.49 per pound of apples

It's never a bad idea to check your answer

2(1.49) + 10(0.99) = 12.88      Solve

2.98 + 9.90 = 12.88               Confirm

Answer:

-10

Step-by-step explanation:

On the number line -9 appear before -10. Thw futher the number, the smaller it gets

answer:-2/-4

hope its right and help u

The value for the functions (fg)(x) and (f/g)(x) are \(x^5 + 2x^4\) and \(\frac{x^4}{(x+2)}\) respectively.

What is a function?

In mathematics, a function is a unique arrangement of the inputs (also referred to as the domain) and their outputs (sometimes referred to as the codomain), where each input has exactly one output and the output can be linked to its input.

To find (fg)(x), we simply need to multiply the two functions f(x) and g(x) -

(fg)(x) = f(x) × g(x)

\(= x^4 \times (x+2)\)

\(= x^5 + 2x^4\)

Therefore, (fg)(x) = \(x^5 + 2x^4\).

To find (f/g)(x), we divide the function f(x) by the function g(x) -

(f/g)(x) = f(x) / g(x)

= \(\frac{x^4}{(x+2)}\)

We cannot simplify this expression any further, so this is our final answer for (f/g)(x).

Therefore, (f/g)(x) = \(\frac{x^4}{(x+2)}\).

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The value of the ratio x : y : z is 1/2 : /3 : 5/18

From the question, we have the following parameters that can be used in our computation:

x:y = 1/2:1/3 and y:z = 1/5:1/6

Express the ratio properly

So, we have the following representation

x : y = 1/2 : 1/3 and y : z = 1/5 : 1/6

Multiply the ratio y : z = 1/5 : 1/6 by 5/3

So, we have

y : z = 1/3 : 5/18

So, we have

x : y : y : z = 1/2 : 1/3 : 1/3 : 5/18

Remove the repetition

This gives

x : y : z = 1/2 : /3 : 5/18

Hence, the ratio is 1/2 : /3 : 5/18

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The solution for the given compound inequalities is x > 4 or x< 0 (Letter C).

It is an expression mathematical that represents a non-equal relationship between a number or another algebraic expression. Therefore, it is common to the use following symbols: ≤ (less than or equal to), ≥ (greater than or equal to), < (less than), and > (greater than).

The solutions for inequalities can be given by: a graph in a number line or numbers.

For solving this exercise, it is necessary to find a number solution for the given inequality.

The compound inequalities are:

-4x < -16 (1)

5x + 10 < 10 (2)

For equation 1, the solution is

-4x < -16 *(-1)

4x > 16

x> 4

For equation 2, the solution is

5x + 10 < 10

5x < 10 -10

5x < 0

x < 0

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Answer:

Step-by-step explanation:

you could do is buy 2x on the x-axis