How to do this step by step.

-4(1-t) + 7t

Multiply/Factor out -4 into whats in the parenthesis

-4(1-t) ---> (-4) x (1) (-4) x (-t)

Multiply

(-4) x (1) ---> -4 (-4) x (-t) ---> 4t (negative times a negative is a positive)

So now your problem reads -4 + 4t + 7t

Combine like terms

-4 + 4t + 7t ---> -4 + 11t

Answer

11t - 4 or -4 + 11t (answers are same. It depends on how your answer choice is and usually variables are written first)