Are the lines x=5 and y=-9 perpendicular

A vertical pole 12 feet high casts a shadow 8 feet long on the ground. At the same time, a nearby tower casts a 40 feet long shadow on the ground. What is the height of the tower?

Simplify (5x^3y^2-4x^2y+2x) - (6x^3y^2-3x^2y+y)

kylee has a coin and a number cube. she flips the coin once and rolls the number cube once. what is the probability that the coin lands tails-up and the cube lands on a 4?

Find the constant of variation for the relation and use it to write an equation for the statement. Then solve the equation. If y varies inversely as the square of x, and y=4/63 when x=3, find y when x=5

The circumference of a circle is divided into twelve equal arcs. The measure of each arc is degrees.

Let x represent any number in the set of even integers greater that 1 which inequality is a true for all values of x? A. X<0 B. X>0 C. X<4 D. X>4

2lb/wk = how many oz per day "

3 (5-2x) = -4 (cx+4) What value for c in the equation above will make the equation have no solutions?

Five times a number yield 20

What is the line slope passing through (-3,1) and (-1,5) a. 2 b.-2 c.-1 d. 1