In this question, you're trying to find the unit rate in which the teacher can grade tests.
A unit rate is another word for "rate of change".
This means that we have to find how many tests the teacher could grade in 1 minute.
To find the unit rate, divide 18 by 15
18 ÷ 15 = 1.2
This means that Mr. Rivera can grade 1.2 tests in 1 minute.
Answer:
1.2 tests
He sold all general admission tickets
Can prove using simultaneous equations
50x + 60y = $1050
x + y = 21 => y = 21-x
50x + 60(21-x) = 1050
50x + 1260 - 60x = 1050
-10x = 1050 - 1260
-10x = -210
x = -210/-10
x = 21
x + y = 21
21 + y = 21
y=0
Since he sold 21 general admission tickets and no VIP tickets
Answer: x = 35
Step-by-step explanation:
since its a 90 degree angle the equation is equal to 90
2x + 20(-20) = 90(-20)
2x/2 = 70/2
x = 35
hope this helps :))
The sum of (4x2+5x-12) + (7x2-6x+7)= -x+17
