Direct variation is of the form y=kx, where k is the constant of variation. It is "direct" because as x increases/decreases so does y in the same magnitude.
y=kx, In this case the dependent variable y, is miles and the independent variable x, is gallons. We are told that the car gets 28mi/gal so
y=28x
answer and step by step in the attachment
1. False
2. True
3. True
4. True
(I might be wrong but I hope this helps :))
Answer:

Step-by-step explanation:
Let's first get our variables straight. M is how much money you make each night, and h is the amount of hours she works.
This means that M will be what our function is equal to, aka the y-axis. h will be the x-axis.
We know that you earn a rate of $50 per night through tax, and your hours worked doesn't influence this in any way. That means there will be a constant on this function, +50.
We also know that you earn 7.50$ per hour, which is directly influenced by how many hours you work, so we will have
.
Combining this all together, we get
.
Hope this helped!
Step-by-step explanation:
it is a multiple of 21.
the highest common factor of 2 numbers is the longest combination of prime factors they have in common.
the prime factors of 21 are simply
3×7
if another number A shares this as the longest combination of prime factors, that means it contains 3×7 itself in its prime factors.
and that means this number A can only be a multiple of 3×7 (= 21), as other prime factors present would be the factor of 21.