Hi again :)
5b^3(4 - 9b^2)
Use the distributive property
=(5b^3)(4) + (5b^3)(-9b^2)
= 20b^3 - 45b^5
= -45b^5 + 20b^3
Have a nice day!
Positive, it will never be negative
Hello!
Deanna starts running at 7:30, and runs for an hour and a half. Meaning, 1:30
To find out how long she ends up running, we must add the hour and a half to the time she started running:
7:30 + 1:30 = 9:00
Deanna ends up running until 9:00.
Answer:
(D) A stratified random sample
Step-by-step explanation:
A stratified random samples are samples that involves the use of stratified random sampling (or stratification) which involves the partition or division of a population into smaller subgroups (called strata). The division is done based on some shared characteristics and attributes. The case above is a stratified random sample because it involves the division of shoreline(population) into 100-foot plots(stratas or subgroups).
