Thomas calculates 9*7 by thinking avout it as 70-7=63. Explain thomas' strategy.

A contractor digs a rectangular hole that is 40 feet long and 10 1/2 feet deep. what is the width of the hole if 6510 cubic feet of dirt is removed?

What is the value of y? - 22 when y=6 and 2 = 5?

Round 76m to 1 significant figure

Solve the system by using the substitution method. x+y=3. Y=x^2-7x+11

Ana buys a sweater for $ 48.50. He must pay 6% sales tax. How much tax must Daniel pay?

A ladder leans against a building. The angle of elevation of the ladder is 70°. The top of the ladder is 25 ft from the ground. To the nearest tenth of a foot, how far from the building is the base of the ladder? 20.5 ft 30.5 ft 32.3 ft 39.5 ft

First day I read 1/4 of a novel, second day I read 1/2 of the remaining pages. On the third day I read the remaining 108pages. How many pages are in the novel.

Carmen bought a plant that is 4 centimeters tall. Each Week the plant grows an additional 2 centimeters. Write an expression to show the height of the plant after W weeks

Find the discriminant 2x^2+8x+8=0

Which of the following equations correctly represents a circle centered at the origin with a radius of 5? A. x 2 + y 2 = 25 B. x 2 + y 2 = 5 C. (x - 5) 2 + y 2 = 25 D. (x - 5) 2 + (y - 5) 2 = 5