15f -8f+ 13= 55
⇒ 7f+ 13= 55
⇒ 7f= 55- 13
⇒ 7f= 42
⇒ f= 42/7
⇒ f=6
Final answer: f=6~
9. X=7. 7-8=-1
8. X=18. 18-7=11
Answer:
s = 5.1
Step-by-step explanation:

Multiply both sides of the equation by 10

Expand

Subtract 28 from both sides

Simplify

Divide both sides of the equation by 10

Simplify

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Answer:
4/50 or 2/25
Step-by-step explanation:
Slope/rate of change is defined as the vertical distance over horizontal. then simplify.