A machine in a factory builds 15 toys in 135 min. How many toys does the machine build in 216 min?

In the 99-story house there is an elevator with two buttons only. If you click on the first button, you will go 7 floors up, if you click on the second one then you go 9 floors down. How can you get from the first floor to the 72nd?

What number should be added to both side of the equation to complete the square? X^2-10x=7

find three consecutive even integers such that the sum of the smallest number and twice the middle number is 20 more than the largest number

Twenty seven minus 4 times a number is equal to 3 times the number minus 29

Lizy bought 4 bags of apples. Each bag had the same number of apples. Her mom gave her 8 more apples. Now Liz has 36 apples. How many apple were in each bag

Dave buys a baseball for $15 plus an 8% tax. Mel buys a football for $20 plus an 8$ tax. How much did each person pay?

Simplify (-80/-20) -4 4 -40 40

Suppose that the following relations are defined on the set A = {1, 2, 3, 4}. R1={ (2,2), (2,3), (2,4), (3,2), (3,3), (3,4) }, R2={ (1,1), (1,2), (2,1), (2,2), (3,3), (4,4) }, R3={ (2,4), (4,2) }, R4={ (1,2), (2,3), (3,4) }, R5=

The cost to place a collect call was $1.50for the minute plus $1.00 for each additional minute. what was the cost of a 5-minute phone call

Which set does not contain - 3? A) the set of all real numbers B) the set of all integers C) the set of all whole numbers D) the set of all rational numbers