Answer:1. 16
2. 21
3. 150
4. 156
Step-by-step explanation: for the first 2 you divide the number without the variable and the number with the variable. With the last 2 you multiply the number with and without the variable together.
Answer:
The equations could be used to find one of the numbers is, 
Step-by-step explanation
Let two integers be a and b.
As per the given statement:
The product of two integers is 112.
⇒
......[1]
Also, One number is 4 more than three times the other.
⇒b = 3a +4 ......[2]
Now substitute equation [1] in [2] we get

Using distributive property i.e, 

Simplify:

therefore, the equation that could be used to find one of the numbers is;

A unit rate compares a quantity to one unit of measure. You often see the speed at which an object is traveling in terms of its unit rate.