9a+5b you need to distribute the numbers in parenthesis
Recall your d = rt, or distance = rate * time
notice, the time he took to cover 63 miles with the wind, is the same amount of time he took against it with 51 miles only, let's say, he took "t" hours long
and he was cycling at a rate of "r"
thus

solve for "r"
I'll help.


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"How it can be 57 ?"
The number 19 is multiplied by the number 3 at the bottom left.
19 × 3 = 57.
Answer:
Step-by-step explanation:
label sides adjacent h and o
sin(30) times 12 = 6 = 10