Consider the algebraic expression - -50 + 2a

a. Write a sentence to describe the meaning of the algebraic expression.

b. Evaluate the expression when a = 2.5. Show your work.

-45

Step-by-step explanation:

-50 + 2a represents the sum of the constant - 50 and twice the value of the variable a.

If a = 2.5, then - 50 + 2a has the value - 50 + 2 (2.5) = - 50 + 5 = - 45.