Answer:no
Step-by-step explanation:
Hello luv! So here is how I will evaluate this expression
-4x+7, x=-1 so you are using substitution
-4(-1)+7
=11
:)
Suppose A equals 10. Lets use 20% of 10, or 2.
10/2 = 5.
As we can see, the equations varies depending on the percentage used. We can effectively conclude that:
A/(1/5A)
5A.
The equation is equal to the reciprocal percentage times A.
Another example:
50 divided by 10% of 50 (5).
50/5 = A
50 * 1/5 = A
10 = A
I would say that B. is the right answer.
Answer:
Part A:
The vertex : x = - b / 2 a = - 28 : ( - 2 ) = 14
y = f ( 14 ) = - 14² + 28 · 14 - 192 = 196 + 392 - 192 = 4
The vertex is ( 14, 4 ). It means that the maximum hourly profit is $4, and that the shop should sell 14 sodas to reach the maximum.
Part B :
We will solve the quadratic equation:
x 1/2 = ( - 28 +/- sqrt ( 784 - 768 ) ) / ( - 2 )
x 1 = 12, x 2 = 16.
It means that if the shop must sell more than 12 and less then 16 sodas if they want to make a profit ( 13, 14, or 15 ). If they sell 12, or 16 they will brake even.
I think
