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REY [17]
3 years ago
7

Derek has $20 to spend on used books. Hardcover books cost $5 each and paperbacks cost $2 each. Complete the equation which dete

rmines the number x of hardcover books and the number y of paperback books he can buy.
Mathematics
1 answer:
nikdorinn [45]3 years ago
8 0

Answer:

The expression would be 5x + 2y = 20

Step-by-step explanation:

We let x be no of hardcover books, and 5x the cost of those books

Same for paperbacks.

then we add them up to 20.

Done!

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Answer:

t=4

Step-by-step explanation:

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nick received a 5% commission on his total sales. Last week his sales totaled $2,500. How much did nick earn in commission last
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3 years ago
From the parking lot at red hill shopping center the angle of the top of the hill is about 25 from the base of the hill the angl
eimsori [14]

Answer:

512 ft.

Step-by-step explanation:

From the parking lot at the Red Hill Shopping Center, the angle of sight (elevation) to the top of the hill is about 25. From the base of the hill you can also sight the top but at an angle of 55. The horizontal distance between sightings is 740 feet. How high is Red Hill? Show your subproblems.

Solution:

Let x be the distance from the base of the hill to the middle of the hill perpendicular to the height, let h be the height of the hill. Therefore:

tan 25 = h/(x + 740)

h = (x + 740)tan 25       (1)

tan 55 = h / x

h = x tan 55        (2)

Hence:

(x + 740)tan 25 = xtan 55

0.4663(x + 740) = 1.428x

0.4663x + 345.07 = 1.428x

0.9617x = 345.07

x = 359 ft.

h = xtan55 = 359 tan(55) = 512 ft.

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2 years ago
Find the slope of the line.
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