Five notebooks cost $20. at this rate, how much would 4 notebooks cost

What is the answer for this problem 9=18x.

Is a pair of adjacent supplementary angles forms a right angle yes or no and why

How do I simplify the form of expression? (4x + 5) (x - 7) - 4x^2 + 10x = 9

Which expression is equivalent to - 3 - 3x - 1 + x? A. 2x - 4 B. - 2x+4 C. - 2x-4? D. 4-2x

A radio station had 135 tickets to a concert. They gave away 2 times as many tickets to listeners as to employees. How many tickets did they give away to employees?

Suppose that 50% of all college students smoke cigarettes. a sample of 14 is selected randomly. what is the probability that less than 13 students smoke?

Which inequality models this situation? The distance to the lake is greater than 5.5 km. A. d > 6 B. d < 5.5 C. d > 5.5 D. d < 6

A plane flew 193 km in 12 minutes. At a constant speed what was the speed of the air plane at km per hour?

X times x + 3 to the power of 2 equals 48, what is x?

At a track meet, Jacob and daniel compete in 220 m hurdles. Daniels finishes in 3/4 of the a min. Jacob finishes with 5/12 of a min remaining. who ran the race in faster time?