Three times the difference of a number and 7 is equal to 18

At a restaurant 21 people had breakfast on Saturday morning. 1/7 of the people are eggs only. 2/3 of the people ate both pancakes and eggs. The remaining people ate pancakes only.

The radius r of a circle is increasing at a rate of 8 centimeters per minute. find the rate of change of the area when r = 39 centimeters

Given that HCF (156, 78) = 78, LCM (156, 78) is (A) 156 (B) 78 (C) 156 78 (D) 156 x 2

How do you know if something is linear

Mark buys last year's best-selling novel, in hardcover, for $16.80. This is with a 20% discount from the original price. What was the original price of the novel?

Explain how i can find the answer to the math problem

There are 108 tiles and 9 lights what is the ratio of lights to tiles

What are the factors of 83?

6x + 7y + x-8y = 7x - y Write down three other expressions that are equal to 7x - y

There are two couches against a wall. if one takes up 4/9 of the wall and the other takes up 1/5 of the wall, how much of the wall is covered by couches?