MATHEMATICS MIDDLE SCHOOL

1. 7x-4y= -8 and x+2y= 14 solution as (x,y) pls help!!

Answers

Answer 1
Answer:

Answer:

(2 2/9, 12 5/9)

Step-by-step explanation:

multiply both sides of x+2y=14 by 2: 2x+4y=28

Add 7x-4y=-8 and 2x+4y=28: 9x=20

x=20/9

Plug in 20/9 into x+2y=14: 20/9+2y=14

2y=11 7/9

y= 11 14/9

y= 12 5/9
Answer 2
Answer:

Answer:

29,-14

Step-by-step explanation:

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David can finish painting the room in 6 hours, and his elder brother Antony can finish it in 4 hours. If both brothers paint the room together, how many hours will it take them?

Answers

Both brothers paint the room together, it will take 2 hours 22 minutes.

Given that,

David can finish painting the room in 6 hours,

And his elder brother Antony can finish it in 4 hours.

We have to determine,

If both brothers paint the room together, how many hours will it take them.

According to the question,

David can finish painting the room in 6 hours,

And his elder brother Antony can finish it in 4 hours.

The combined time is given by the following formula.

Therefore,

For both brothers paint the room together, how many hours will it take them,

Taking reciprocal of both brothers time.

Then,

(1)/(6) + (1)/(4) = (1)/(t) \n\n(2+3)/(12) = (1)/(t) \n\nt = (12)/(5) \n\nt = 2.4

Which is equals to 2 hours 22 minutes.

Hence, Both brothers paint the room together, it will take 2 hours 22 minutes.

For more information about Division click the link given below.

brainly.com/question/16663851

Answer:

Step-by-step explanation:

1/6+1/4=5/12

5/12 of the job is done in 1 hour

so

5/12+5/12= 10/12

so 10/12 of the job is done in 2 hours

and then simplify 5/6 so then add 1/6

so it is done in 2 hours and 24 minutes

5) Rolanda scored 20, 15, and 16 on her first three math quizzes. Jetta scored 16, 19, and 17 on her quizzes. Using e the mean to compare, who has the higher math quiz scores so far?

Answers

Roland; 20+15+16=51, 51÷3= 17
Roland; 17
 We divide 3 because it's the total number of grade she got.
Jetta; 16+19+17=52, 52÷3= 17.1
Jetta; 17.1
 So, probably Jetta got better grade than Rolanda 

Answer: Jetta got better grade than Rolanda

Step-by-step explanation:

Y=2x-1 the order pair is

Answers


There are an infinite number of possibilities,
and you didn't give us any choices.

Here are a few:

(-3, -7)
(-2, -5)
(-1, -3)
(0, -1)
(1, 1)
(2, 3)
(3, 5)
(4, 7)
(5, 9)
(1.647, 2.294)

A triangular pyramid has a base that is 31 feet and a height that is three times its base. What is the volume of the triangular pyramid?

Answers

Answer:

2,883

Step-by-step explanation:

Well the base of the triangle is

What is n times 7 what does it equals

Answers

Answer:

It gives 7n

Step-by-step explanation:

When a number is multiplied by a number it an actual number

But in this case 7 is to be multiplied by n

Which means

7×n=7n

Answer:

It gives 7n

Step-by-step explanation:

When a number is multiplied by a number it an actual number

But in this case 7 is to be multiplied by n

Which means

7×n=7n

Ill give brainly for right answers

Answers

Answer:

7) scale factor = 3

8) x = 36 feet

Step-by-step explanation:

8) 8/24 = 12/x

8x = 288

x = 36

Answer:

7) scale factor = 3

8) x = 36 feet

Step-by-step explanation:

:)
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