How and why is d=tr, r=d/t and t=d/r the same formula

Billy will earn $8 per hour and work 12 hours per week how much will he earn in one week

Suppose a brand of light bulbs is normally distributed, with a mean life of 1300 hr and a standard deviation of 50 hr. Find the probability that a light bulb of that brand lasts between 1225 hr and 1365 hr.

Evaluate the function f (x) = 4^x for x = 3. A. 12 B. 24 C. 32 D. 64

The class has 14 boys, 12 girls, and one teacher. What is the ratio boys to girls?

In the function V-1 = (4x) + 7, what effect does the number 4 have on the graph, as compared to the graph of y=xº?

Guys, I have a life question. So my BFF that i met in school (I had to switch schools) decided she was gonna quit a game that was our only communication. She said she is never gonna be on again and i'm sad because she NEVER responds to my texts.

Bill scores on his first four tests were 85, 90, 86 and 93. What will he have to score on his next test to obtain an average of atleast 90 for the term

Solve by elimination 4x+5y=15 6x-4y=11

Solve. Alex borrowed $12.50 from his friend Danilo. He paid him back $8.75. How much does he still owe?

Jaylon makes twice as much an hour as Sam. Sam makes x dollars an hour. Write an expression describing how much Jaylon makes an hour. A) 2x B) x2 C) 2 + x D) x - 2 Eliminate E) x : 2