Two companies sell shirts. • Shirts-R-Us charges a shipping fee of $50, and each shirt costs $4.
• We-Sell-Shirts charges a shipping fee of $25, and each shirt costs $9.
How many shirts must each company sell for the costs to be equal?
O A. 8 shirts
B
15 shirts
O
C. 5 shirts
D. 13 shirts

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?