Answer:
644
Step-by-step explanation:
SA=[2×(5×20 + 5×6 + 20×6)] +
[2×(4×12 + 4×6 + 12×6)] -
[ 2× 12×6]
= [2×(250)]+[2×(144)] - [144]
= 500+288-144
= 644 cm²

For the first one, you take the original temprature -3.0° and add -5.4° which gives you an answer of -8.4°c :)

for the second you add the amount for breakfast and lunch, then multiply by 7 days
A. Arithmetic hope this helped!
He took home $160 after donating 20% (which is $40)