Select the pair of equations whose graphs are perpendicular.
a.) 5x - 8y = 9
12x - 5y = 7
b.) 3x + 6y = 8
y = 3x - 8
c.) y = 2x - 7
x + 3y = 3
d.) 2y = -3x + 5
2x - 3y = 4

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Evaluate the function , when d = {9, 15, 30}. r = {5, 7, 12} r = {6, 10, 15} r = {6, 10, 20} r = {5, 12, 20}