Solve each system by substitution

-8x-y=-21
2x+4y=-6

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s? a. 56.3 b. 33.7 c. 41.8 d. 48.2