Solve the problem.When making a telephone call using a calling card, a call lasting 4 minutes cost $2.10. A call lasting 11 minutes cost $4.90. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that models the cost of a making a call lasting x minutes.
A. y = 0.4x - 6.1
B. y = 0.4x + 0.5
C. y = 
x - 
D. y = -0.4x + 3.7
Answer: B
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A man hikes up a mountain to the peak, where he rests for a few minutes and then continues down the other side of the mountain. We measure his location as distance up from the base of the mountain. What can be said about the man's velocity when he is hiking up the mountain?
A. Velocity is positive. B. Velocity is negative. C. Velocity is 0. D. None of the above.
Find the sum. Simplify when necessary.(-16) + (-17) + 9
A. 8 B. -24 C. 10 D. 42
Estimate the sum, difference, product, or quotient involved in the problem.Recently, a hardware store sold premium exterior house stain for $21.20 per gallon. Estimate how many gallons could be bought with $63.88.
A. 5 gal B. 3 gal C. 30 gal D. 0.3 gal
Write the number in scientific notation.0.00005262
A. 5.262 × 10-4 B. 5.262 × 104 C. 5.262 × 105 D. 5.262 × 10-5