How to solve 7 + (-15) + 12

Three planes, E, F, and G intersect so that each is perpendicular to the other two. A segment AB is positioned so that the length of its projection on the intersection of E and F is 1, on the intersection of F and G is 2, and on the intersection of

The area of Kamila's rectangular living room is 2.5 times the area of her square bedroom. The length of the living room is 18 feet and its width is 1.25 times the length of a side of the bedroom.

One log is 28 feet 7 inches long, and another is 39 feet 8 inches long. what is the sum of their length

1) On Wednesday 62% of the customers who bought gas at a gas station made additional purchases. There were 350 customers who bought gas. How many of these 350 customers made additional purchases?

James has 10 friends. He has 13 enemies. If he multiplies both of them 10 and 13 times 2. How much enemies and friends does he have all together.

Find the angle between each of the following pairs of vectors A⃗ = Axi^+Ayj^ and B⃗ = Bxi^+Byj^ ... Ax1 = - 3.20, Ay1 = 4.40; Bx1 = 2.70, By1 = - 3.10. i know this is dot prodoct but the calculater just keep saying error

What is the discriminant D of the equation? 3g² + 15g + 10 = 0

Three less than a 6 times a number is 39. find the number

Pam is playing with red and black marbles. the number of red marbles she has is three more than twice the number of black marbles she has. she has 42 marbles in all. how many red marbles does pam have

While painting her room, Paige used of a can of paint to paint one wall and used of a can of paint for the other wall. How much paint did Paige use to cover both walls?