Answer: 
Step-by-step explanation:
1. As you can see, 
is equal to the other quadratic equation 
.
2. Then, this would the same as write the quadratic equations as following:
3. And then set them equal to each other, as you can see below:
Substituting, you obtain:
3. Keeping the above on mind, you can set up the given equations as a system of equations as folllowing:
Yes because it is a linear equation
If I did it right, it is 120
If you draw the line and mark -2 and 3 you find that they are 5 apart. By calculation, subtract the lowest from the highest: 3 - -2 = 3+2 = 5
Solution: Let x be the height of a student in Marta's class.
The mean height of 18 students in Marta's class is 60 inches
We know that:
Therefore, the total measure of all 18 student's heights is 1080 inches
