Answer:
A.
Step-by-step explanation:
Multiplying by moves the decimal point n places to the right.
Doing so 8 times for 5.21 gives 521,000,000.
Answer:
4
Step-by-step explanation:
2(7-5)=4
Cosα=adjacent side divided by the hypotenuse
cosA=24/26=12/13
cosB=10/26=5/13
I think 8.0 is the answer