Solve the problem.Punky went to dinner. Her bill was $18.42, and she left a 20% tip. How much was the tip, rounded to the nearest dollar?
A. $22
B. $4
C. $7
D. $37
Answer: B
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Solve the differential equation subject to the initial conditions.
- xy - x = 0; y = 10 when x = 1
A. y = -1 + 11e-x2
B. y = - 
+ 11e-x2
C. y = - 
+ 
ex2 - 1
D. y = -1 + 11e(x2 - 1)/2
Solve the problem.A rose garden has 21 bushes in one row, 17 bushes in the next row, then 13, and so on. If there are 66 bushes in the garden, how many rows are planted?
A. 7 rows B. 6 rows C. 4 rows D. 5 rows
Solve the problem.A chemist needs 120 milliliters of a 39% solution but has only 23% and 71% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 40 mL of 23%; 80 mL of 71% B. 30 mL of 23%; 90 mL of 71% C. 80 mL of 23%; 40 mL of 71% D. 90 mL of 23%; 30 mL of 71%
Translate using numbers and symbols.The quotient of 54 and a number
A. x - 54 B. 54 - x C. 54 ÷ x D. x ÷ 54