How to solve this question 7v-v=12

A health conscious student faithfully wears a device that tracks his steps. Suppose that the distribution of the number of steps he takes is normally distributed with a mean of 10,000 and a standard deviation of 1,500 steps.

one bag holds 12 bolts. several bags filled with bolts are packed into a box and shipped to the factory The box contain a total of 2760 bolts. how many bags of bolts are in the box

Amira has 3/4 of a bag of cat food. Her cat eats 1/10 of a bag per week. How many weeks will the food last.

Sample of 3 items is selected at random from a box containing 20 items of which 4 aredefective. find the expected number of defective items in the sample.

Cost to store:? Markup:80% selling price$122.40 what is the starting cost?

What is the slope of y=x+5?

A store sold 28 boxes of juice from a case containing 48 boxes. Approximately what percent of the case of juice has been sold?

a box contains 12 1/2 square feet of tiles and cost $40.21. What is the approximate price per square foot?

Dustin is three times as old as Margaret. In 7 years he will be twice as old as she will be then. How old is she now?

F (x) = (x + 2) (x - 1) (x - 2) b) Find the y-intercept of the function.