Answer:
7c+21
Step-by-step explanation:
multiply 7 by c and 7 times 3
7c and 21
7c+21
It's 1017.88 hope this helps
Answer:
Step-by-step explanation:
15 mph just multiply it
we can use pythagorean identieis
remember that 
also remember that
and 
so if we take
and divide both sides by
we get



subtracting
from both sides

now subsitute into original problem



the answer is -1
A typewriter costing $75.00 marked up 40% on cost M = 40 and S = 105