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Alik [6]
3 years ago
7

Jamal bought a diamond ring at a 20% discount. He paid $2640 for the ring. Naomi bought a similar ring but was given a discount

of $924. What was the percentage discount given to Naomi?
Mathematics
1 answer:
Fudgin [204]3 years ago
7 0

Answer: 72%

Step-by-step explanation:

Set Jamal's original ring price = x

x - x(0.2) = 2640\\x(1-0.2)=2640\\x(0.8)=2640\\x=\frac{2640}{0.8}=3300

Jamal's original ring price = $3300

Set Naomi's discount = y

3300-3300(y)=924\\=3300(1-y)=924\\1-y=\frac{924}{3300} \\-y=\frac{924}{3300} -1\\y=1-\frac{924}{3300}=1-0.28=0.72

Naomi's discount is 0.72 = 72%

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Answer:

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Step-by-step explanation:

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(b) Which partial derivative tells us the increase in I per degree increase in T when (T ,H) = (95, 50)? Calculate this partial derivative.

This is the partial derivative of I in function of T, that is I_{T}(T,H). So

I(T,H) = 45.33 + 0.6845T + 5.758H - 0.00365T^{2} - 0.1565TH + 0.001HT^{2}

I_{T}(T,H) = 0.6845 - 2*0.00365T - 0.1565H + 2*0.001H

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Answer:

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Step-by-step explanation:

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