The first and second step to solve the equation 3x/5+=20

a) The step where Mardie first made an error is given as follows: Step 1, as the negative sign means that the sign of each term inside the parenthesis should be changed.

b) The correct expression is given as follows: -8.6b + 28.

The expression in the context of this problem is defined as follows:

(-3.78b + 12) - (4.82b - 16).

The negative sign before the parenthesis means that the sign of each term inside the parenthesis is changed, hence:

-3.78b + 12 - 4.82b + 16.

This is the step where Maddie made the first error.

Then, to simplify the expression, we combine the like terms, as follows:

b(-3.78 - 4.82) + 12 + 16 = -8.6b + 28.

More can be learned about simplification of expressions at https://brainly.com/question/723406

#SPJ1

Answer:

D

Step-by-step explanation:

It is first rotated 90 degrees clockwise

Then it is translated 6 units up and 4 units to the right

Answer:

- 3/4

Step-by-step explanation:

Answer:

The answer is -0.75 or -3/4

Answer: B, C, and E

Step-by-step explanation:

you can change the size of each of those and you will get the same shape equivalent to A.

Answer:

-20/-56

Step-by-step explanation:

so I gotta but at least 20 characters here but I think that's right

The cost of 1 book is $10.75 and the cost of 1 pen is $1.80.

Given,

Number of books bought by Lana is = 2

Number of pens bought by Lana is = 4

Total expenditure by Lana for purchasing 2 books and 4 pens = $28.70

Let the cost of 1 book be x and the cost 1 pen be y.

Then the first equation will be 2x + 4y = 28.70                     (i)

Number of books bought by Angelina is = 2

Number of pens bought by Angelina is = 10

Total expenditure by Angelina for purchasing 2 books and 10 pens = $39.50                            

Then the second equation will be 2x + 10y = 39.50              (ii)

Number of books bought by Donna is = 2

Number of pens bought by Donna is = 12

Total expenditure by Donna for purchasing 2 books and 12 pens = $41.80

Then the third equation will be 2x + 12y = 41.80                     (iii)

On solving equation (i) and (ii),

2x + 4y = 28.70 ⇒ x = (28.70 - 4y) / 2 ⇒ x = 14.35 - 2y

Now substituting the value of x in equation (ii),

2(14.35 - 2y ) + 10y = 39.50 ⇒ 28.70 - 4y + 10y = 39.50

⇒28.70 + 6y = 39.50 ⇒ y = 10.8/6 ⇒ y = 1.80

Then x = 14.35 - 2y = 14.35 - 2×1.80 = 10.75 ⇒ x = 10.75

Hence, the cost of 1 book is $10.75 and the cost of 1 pen is $1.80.

To learn more about the equations :

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Answer:

The cost of 1 book is $10.75 and the cost of 1 pen is $1.80.

Step-by-step explanation:

Answer:

4400

Step-by-step explanation:

I think this is right sorry if its not. Have a good night, sorry if im late.

Answer:

  4600 miles

Step-by-step explanation:

You want to know the difference in miles per hour between a satellite traveling 45000 miles in 5 hours and one traveling 79200 miles in 18 hours.

The speed in miles per hour is the ratio of miles to corresponding hours. The difference in miles traveled in one hour will be ...

  A speed - B speed

  45000 mi/(5 h) - 79200 mi/(18 h) = 4600 mi/h

Explorer B travels 4600 fewer miles in an hour than Explorer A.

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Answer

i found it on the internet

Answer:

28.4

Step-by-step explanation:

40% times 71 = 28.4

BRAINLIEST PLEASE

Answer:

Option (B):3

Step-by-step explanation:

S.A of Box J =57ft^2 ; using formula 2(lb+lh+hb)

S.A of BoxF=54Ft^2;using formula (6a^2)

Differenceof S.A of boxes:57-54=3

Answer:

ttt

Step-by-step explanation:

Answer:

30p=30p

Step-by-step explanation:

6x5p=30p 6x5=30p

Answer:

Step-by-step explanation:

reason 1:

opening of brackets to solve the expression

reason 2:

in multiplication order is followed i.e. the number always lead the variable in the expression

reason 3:

for clarification brackets are added to multiply like terms i.e. numbers with numbers and variable with the variable

reason 4:

the solved and simplified expression is delivered as a result

Answer:

x = 1

Step-by-step explanation:

18 - 7x = 3 + 8x

-18        -18

-7x = -15 + 8x

-8x          -8x

-15x (÷ -15) = -15 (÷ -15)

x = 1

Answer:

x = 1

Step-by-step explanation:

18 = 3 + 15 x

15 = 15x

x = 1

PLUG IN THE 1 TO CHECK:

18 - 7 = 11

3 + 8 = 11

11 = 11

Answer:

Step-by-step explanation:

+ Because of " the line passing through the points (-2, 2) and (3,-1)", that means this line has its equation y = ax + b where

\(a=\frac{2-(-1)}{-2-3} =\frac{2+1}{-5} =-\frac{3}{5}\)

So we write its equation: y = -3/5 x + b.

+ Then, now, we replace x = -2 and y = 2 into y = -3/5 x + b for finding b like:

2 = -3/5 * (-2) + b or 2 = 6/5 + b

so b = 2 - 6/5 = 4/5.

And this line has its equation: y = -3/5 x  + 4/5.

Mẹthod 2:

we have a formule for a line that passes 2 points \((x_{0},y_{0}) , (x_{1},y_{1}) ,x_{0}\neq x_{1}\)

Here is: \(\frac{x-x_{0} }{x_{1}-x_{0} } = \frac{y-y_{0} }{y_{1}-y_{0} }\)

Then, we can write for this case:

\(\frac{x-(-2)}{3-(-2)} =\frac{y-2}{-1-2} \\\frac{x+2}{5} =\frac{y-2}{-3} \\-3(x+2) = 5( y-2)\\-3x-6=5y-10\\3x+5y-4=0\\or\\y=-\frac{3}{5}x+\frac{4}{3}\)

P.S: You type wrongly the signs?

Answer: to get the answer you will need more information

Step-by-step explanation:

this problem does not show how much strawberries or lemons cost separately so there is now possible answer

Answer:

= -223

Step-by-step explanation:

hope this will help u mate :)

#shadow

Answer: A

Step-by-step explanation:  578*0.09=52.02~ is 50

Answer:

correct answer is 7 years

Step-by-step explanation:

A+56=9(A)

56+9A

A=7

he will be 7 years old he is pretty old

Answer:

Kevin is 7 years old right now.

Step-by-step explanation:

Let x be Kevin's age right now, that's what we're trying to find.

In 56 years, he'll be 9 times older than he is now, so we can say:

x + 56 = 9x

Now we can get the x values on the right side of the equation so that:

56 = 8x

Now solve for x and you have his current age which is 7.

Answer: I think the answer is 3600000000, the answer is number 2 which is 3,600,000

Step-by-step explanation: the question says how many smart phones are sold.

Answer: Tina is correct

Step-by-step explanation:

this is because in one foot there are 12 inches and there are 5 feet so 5 X 12= 60 and aaron is 63inches so he is tall enough and 63-60=3 inches so he is 3 inches taller than 5 feet.

Pls give me brainliest!!!

Answer:

Yes. He is 3 inches taller than 5 feet

Step-by-step explanation:

We know that 1 ft is 12 inches

5 ft  * 12 inches/ 1 ft = 60 inches

You must be 60 inches to ride and Aaron is 63 inches

He is 3 inches taller

63 - 60 = 3 inches

Answer:

\(( { {3}^{7} )}^{4} = {3}^{28} \)

Answer:

y=5x-1/4

Step-by-step explanation:

The slope-intercept form would be y=mx+b, where y would be on one side. In this case, we would have to move y to one side. You can add y on both sides to move it on the right. Then, you would subtract 1/4 on both sides to move it to the left so that y is on its own side. Then the equation would equal y=5x-1/4, where 5 = m and -1/4 = b.

Answer:

The calculation to your equation is:

Y=5x-1/4

Step-by-step explanation:

Answer:

500

Step-by-step explanation:

Hi just do 50 x 10 = 500

50...........................................

Answer:

X=1

Step-by-step explanation:

reverse multiplication -

7=4+3x

we know one value so we just isolate the 3x

7-4=3, meaning that 3x has to be equal to 3.

Then we just do 3/3=1 so therefore x=1

Also if you wanna check it then you can plug x=1 into the equation.

4+3*x or 1=4+3=7

Hopefully this helped out, have a great day

Answer:

84.13

Step-by-step explanation: