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July 22, 2014

Homework Help: 7th grade math Ms. Sue please

Posted by Delilah on Wednesday, January 2, 2013 at 9:11pm.

13.
A baseball bat and 8 baseballs cost $163.25. The bat costs $106.45. What is the cost c of one baseball? (1 point)

163.25 – 8c = 106.45; $33.71
8c + 106.45 = 163.25; $7.10
8c + 163.25 = 106.45; $7.10
8c – 106.45 = 163.25; $33.71

14.
Mark weighs 74 pounds. Together, he and his sister weigh six pounds more than three times the weight of his sister. What is the weight, w, of Mark’s sister? (1 point)

74 + w = 3w; 37 lb
74 + w – 6 = 3w; 18.5 lb
74 + w = 3w + 6; 34 lb
74 + w = 3w – 6; 40 lb

15.
Paula sold 35 packages of wrapping paper for this year’s Booster Club fundraiser. This is one less than twice the number of packages that she sold last year. How many packages did Paula sell last year? (1 point)

17 packages
16 packages
20 packages
18 packages

Write and solve an inequality.
16.
An airline requires carry-on luggage to weigh at most 40 pounds. Your suitcase currently weighs 10 pounds. How many pounds p are available for you to fill your suitcase with other items? (1 point)

p – 10 ≤ 40; p ≤ 50
40 – p < 10; p < 30
p + 10 ≥ 40; p ≥ 30
10 + p ≤ 40; p ≤ 30

17.
The speed limit of a highway is 55 miles per hour. A car is traveling at least 65 miles per hour. How many miles per hour m over the speed limit is the car traveling? (1 point)

55 – m ≥ 65; m ≥ 10
m + 65 ≤ 55; m ≤–10
65 – m ≤ 55; m ≤ 10
55 + m ≥ 65; m ≥ 10

18.
Levi earns $6.25 per hour working after school. He needs at least $143.75 for a stereo system. How many hours h does he need to work to reach his goal? (1 point)

h over six point two five> 143.75; h > 23; 23 hours
6.25h ≤ 143.75; h ≤ 23; 23 hours
h over six point two five < 143.75; h < 23; 23 hours
6.25h ≥ 143.75; h ≥ 23; 23 hours

My answers:
13. 8c + 106.45 = 163.25; $7.10
14. 74 + w = 3w + 6; 34 lb
15. 18 packages
16. 10 + p ≤ 40; p ≤ 30
17. 55 + m ≥ 65; m ≥ 10
18. 6.25h ≥ 143.75; h ≥ 23; 23 hours

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