-2.5 because a positives opposite is a negative.
Answer:
Step-by-step explanation:

Answer:
D
Step-by-step explanation:
x/20 = 21/14 (similar proportions)
x/20 = 3/2 (simplify by canceling out a factor of 7)
x = 30
Answer: y = -3/4x - 15/16
Step-by-step explanation: Write in slope-intercept form, y=mx+b.
Hope this helps you out! ☺