3 times the difference of a number minus 12 in an expression

How do I show that this function is one-to-one algebraically?

Jose starts with $250 and spends $25 a week. Martin starts with $30 and saves $30 a week. Whe same amount of money? Use x for time and y for saving.

Bob likes to prepare personal pizzas. He begins with a circle of dough that is 12 inches in diameter. On top of the dough, he places slices of salami. All of the slices are round and have a 4-inch diameter.

The base of this solid crate has an area of 6 square meters. The height of the crate is 4 meters. What is the volume of the crate?

A framing company is putting out a new product this summer. The width of the frame will be uniform all the way around.

What is 45 decreased by 12 percent

Zhen is an audiobook narrator. The table gives some completed audio lengths and the amount of time Zhen spends researching, recording, and editing the audiobook. Completed (hours) _ Working time (hours) 1 _ 6 1/2 3 1/2 _ 22 3/4 7 _ 45 1/2 10 _ 65

What Katie bought some flour she used 3/8 of it to bake bread what percent of the flower is left over

Which of the following are independent events? A. Knowing that you have to get up early tomorrow, and going to bed before 9 p. m. B. Knowing that you have a test in school tomorrow, and studying the night before C.

Suppose 826 bricks are used in constructing a wall 14 feet long. How many bricks will be needed for similar 35 feet long?