Answer:
t=−5h+250
h=−t/5+50
Step-by-step explanation:
Factor
find roots
determine intervals between roots for which function is positive or negative
sketch
or use calculus either way
Answer:
Stratified sampling
Step-by-step explanation:
The is a type of sampling in which the population of interest is divided into subpopulations and then each subpopulation is randomly sampled.
In this case study, instead of just doing a random sampling of all students, the research divided the population of all students into subpopulations which includes freshmen, sophomores, juniors and seniors and then she makes a random sampling of each of these subpopulations.
Answer:
x + 9 < 30
"a number" is x and it's the sum (addition) of that and 9 which is less (<) than 30