Isolate the y
add 7 to both sides
y - 7 = 21
y - 7 (+7) = 21 (+7)
y = 21 + 7
y = 28
28 is your answer
hope this helps
Answer:
£74
Step-by-step explanation:
£55.50 = 75%
Find 1% of discounted price by dividing both sides by 75 :
£0.74 = 1%
Using 1%, multiply by 100% to find original price :
£74 = 100%
Check our answer :
£74 × 0.75 (75%) = £55.50 ✅
Hope this helped and brainliest please
Answer:638
Step-by-step explanation:
Answer:
a. D'(p) = -10p - 6
b. There is a decrease of 96 units of demand for each dollar increase
Step-by-step explanation:
The demand function is:

(a) The derivate of the demand function with respect to price gives us the rate of change of demand:

(b) When p = $9, the rate of change of demand is:

This means that, when p = $9, there is a decrease of 96 units of demand for each dollar increase.