Let f(x) = 2x + 2. Solve f-1(x) when x = 4.
A. 1
B. 3
C. 4
D. 10

What is the slope of the line shown below?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4