For questions 15-18, define variables, set up a system of equations, then solve. 15. The sum of two numbers is 58. If their difference is 28, find both numbers.
Variables:
Solve:
System:

Evaluate the expression for the given value of the variable. ∣-4b-8∣+∣-1-b^2 ∣+2b^3 ; b=-2

Find the value of x in the diagram below. select the best answer from the choices provided

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same