A number multiplied by three equals 21. find the number

Let x=the number

Two angles are supplementary. They have the measures of (7x+2) and (3x-2), respectively. What is the value of x?

The zero-product principle states that if AB = 0, then

A rectangular tank has a base that is 10 centimeters by 5 centimeters and a height of 20 centimeters. If the tank is half full of water, by how many centimeters will the water level rise if 325 cubic centimeters are poured into the tank?

What is the slope and the y-intercept of the line y = - 3x + 10

6+2x=48 what would the answer be?

What type of polynomial is this. a 2 + bcd 3

Write the following equation in the general form Ax + By + C = 0. 1/2y - 1/3x - 1 = 0 a. - 2x + 3y - 6 = 0 b. 2x - 3y + 6 = 0 c. 2x - 3y - 6 = 0

I would like to purchase 20 products at a cost of $65 per product. What would be my total with 3.5 sales tax

A bag contains white marbles and red marbles, 90 in total. The number of white marbles is 6 less than 5 times the number of red marbles. How many white marbles are there?

Solve  ABC given  C = 90, a = 88 cm, and c = 117 cm.