1 year ago

Solve the equation using multiplication or division.

Mathematics

1 answer:

Brut [27]1 year ago

3 0

Answer:

y=-4

Step-by-step explanation:

-7y=28

DIVIDE BY -7

28/-7=-4

Answer=-4

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The average (arithmetic mean) of a - 5 and a is x, and the average of a and a + 9 is y. What is the average of x and y?

emmasim [6.3K]

Answer:

The answer is "Option A"

Step-by-step explanation:

Given:

$\to \frac{(a-5)+a}{2}=x.....(a)\\\\\to \frac{a+(a+9)}{2}=y.....(b)\\\\$

solve the above equation:

$\to \bold{\frac{(a-5)+a}{2}=x}\\\\\to \frac{a-5+a}{2}=x\\\\\to \frac{2a-5}{2}=x\\\\\to \bold{\frac{a+(a+9)}{2}=y}\\\\\to \frac{a+a+9}{2}=y\\\\\to \frac{2a+9}{2}=y\\\\$

add both value (x and y):

$\to \bold{x+y}\\\\\to \frac{2a-5}{2}+\frac{2a+9}{2}\\\\\to \frac{2a-5+2a+9}{2}\\\\\to \frac{4a+4}{2}\\\\\to \frac{2(2a+2)}{2}\\\\\to (2a+2)\\$

average of x and y:

$\to \frac{x+y}{2}\\\\\therefore \bold{x+y= 2a+2}\\\\\to \frac{2(a+1)}{2}\\\\\to \boxed{(a+1)}\\$

8 0

3 years ago

60 peoples will be attending a dinner party. each people at the party can seat 8 people. how many tables are needed? Write and s

Gnoma [55]

The answer is 7.5
But u need 8 tables because you cant cut a table in half. The number facts that i used was 60 divided by 8.

PS. Please like this answer or i wont answer anymore of your questions

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4 years ago

Read 2 more answers

Timpony School District surveyed a random sample of 606060 middle school students about the amount of time they watch TV. Of the

Black_prince [1.1K]

Answer:

267

Step-by-step explanation:

1143× 60/14

≈267

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