Answer:
9 + b is an expression
Step-by-step explanation:
Expressions don't have the = sign in them but equations do.
Answer:
288 minutes
Step-by-step explanation:

if you drop the radius to less than that, then the Area will also drop to less than 1 unit, in this case it happens to be a decimeter
The first answer: you have to 560-200 which equals 360 then divide by 45 which equals 8 so your answers 8
The second answers: first 6.91- 1.45= 5.46 then take 5.46 and divide by 0.42 which equals 13 so your answers 13