Please help and show work

7 + 5 i
write in standard form
1 − 4 i

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

Robert is placing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other area is 5.7 feet. the sod costs y dollars per square foot