18-7x=4

13=19+2x

and i need the answer for

Solve the following equations, where t must come from the set of numbers

{2,3,5,7,11,13, ... }, otherwise there s no sollution i need all the workings for these questions!

Insurance companies track life expectancy information to assist in determining the cost of life insurance policies. Last year the average life expectancy of all policyholders was 77 years.

If we wanted to measure the capacity of the waterfall and how deep it was, what unit of measure would we use?

What is 11/15 as a repeating decimal

What is - 1.8 = h - 4.7?

Find three consecutive odd integers such that the sum of the first, two time the second and three times the third is 46

Congruent squares, with side lengths of x, are cut from the corners of a 12-inch-by-16-inch piece of cardboard to form an open box. Which equation models the surface area, y, of the open box after the corners arw cut away?

Bill can mow the lawn in 2 hours, and his younger brother Tom can mow it in 3 hours. If both brothers mow the lawn together, how many hours will it take them?

Write a linear function f with f (-10) = 4 and f (-2) = 4. f (x) =

Relations and functions

How can you tell if a number is devisible by 3?