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course mth 151
8/4 12
Question: `q7.1.18 4(x-9) = 8(x+3). Show how you solved the equation for x.
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Your solution:
x = -15
3
Ok
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Question: `q7.1.39 (2r - 3 ) / 7 + 3/7 = -r/3. Show how you solved the equation for r.
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Your solution:
r = 0 / 13 = 0
3
Ok
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Question: `q7.1.45 .20 ( 14000) + .14 t = .18 (14000 + t ). Show how you solved the equation for t.
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Your solution:
280/.04=.04t/.04
7000=t
3
Ok
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Question: `q7.1.70 A = 1/2 ( B + b ) * h. Show how you solved the equation for B
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Your solution:
B = 2A / h – b
3
Ok
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Question: `q7.2.18 20 million more viewers on Thursday than on Saturday; the total number is 102 million. How many watch each night?
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Your solution:
20 million more on Thursday then if x = number of Saturday viewers in millions, the number of Thursday viewers is x + 20, again in millions.
The total number is 120 million so we have
# of Thursday viewers + # of Saturday viewers = 120; using our expressions we have (x + 20) + x = 120 so that
2x + 20 = 120. Adding -20 to both sides we get
2x + 20 - 20 = 120 - 20 or
2x = 100. Dividing both sides by 2 we get
(2x) / 2 = 100 / 2 so that
x = 50.
3
Ok
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Question: `q7.2.40 Water added to 3 gal of 4% soln to get 3% soln. Show how you solved the problem by setting up and solving an equation.
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Your solution:
On gallon added
3
O
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Question: `q7.2.50 Equal #'s of nickels and quarters, twice as many half-dollars; total $2.60. Show how you solved the problem by setting up and solving an equation.
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Your solution:
2 nickles, 2 quarters and 4 half-dollars
3
Ok
"
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