I know that b and d are correct because c is just silly and a is just incorrect :)
Answer:

Step-by-step explanation:
Let's calculate the answer to the second parenthesis. Just multiply throughout to get -8xyz. Then, multiply the first parenthesis by the second. Multiply the constants (-8 and 2) first to get -16, multiply the x's together to get x^2, the y's together to get y^2, and the z's together to get z^2. Put it all together to get
.
I think b=6. so try that ok
Answer:

Step-by-step explanation:
we know that
The amount of 2,000 miles represent 100%
If the amount is increased by 33%
then
The new percent of the amount will be
100%+33%=133%
so
using proportion
