70+20 equal to the expression

2x10=20; 4x10=40; 8x10=80. What do notice about these problems?

Two pulses traveling on the same string are described by y1 = 5 (a x - b t) 2 + 2 and y2 = - 5 (a x + b t - 6) 2 + 2 where a = 9 m-1 and b = 10 s-1. at what time do the two cancel? answer in units of s.

Find the mean absolute deviation of the data set 8, 10, 15, 8, 12, 13, 12 and 14. Round to the nearest hundredth if necessary.

Write each equation in ax + by = c form 1. y = 5 - 3x 2. x = 2y - 3

A homeowner has two people to mow his land. Person A is able to mow the land in 2 hours by herself. Person B is able to mow the land in 3 hours by himself.

A jogger ran 5 2/3 miles on Tuesday. This was 2 1/4 more miles than she ran on Monday. How many miles did the jogger run on Monday?

Explain why the greatest common factor of two numbers is sometimes one

Write a pair of integers whose sum gives (a) a negative integer (b) zero (c) an integer smaller than both the integers. (d) an integer smaller than only one of the integers. (e) an integer greater than both the integers,

Solve the system of equations. y = 6x-27 y = 4x - 17 a. (-5, 3) b. (-3, - 5) C. (5, 3) d. No solution

Solve for x -6 (-x - 4) = 4 (1 + 4x) x =