Solve the problem.Suppose an object moves along the y-axis so that its location is y = f(x) = x2 + x at time x (y is in meters and x is in seconds). Find the instantaneous velocity at x = 4 seconds.
A. 8 m/s
B. 10 m/s
C. 9 m/s
D. 20 m/s
Answer: C
Mathematics
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Subtract.20 - (-13) + (-6)
A. 27 B. 1 C. -13 D. 13
Mathematics
Use a proportion to solve the problem.Jim drove 400 miles in 8 hours. If he can keep the same pace, how long will it take him to drive 1400 miles?
A. 3200 hr B. 38 hr C. 28 hr D. 56 hr
Mathematics
Solve the problem.In a sale, the price of a computer is reduced from $1580 to $1285. Find the discount and the rate of discount. Round the discount rate to the nearest tenth of a percent if necessary.
A. $285; 22.2% B. $295; 23% C. $285; 18% D. $295; 18.7%
Mathematics
Solve the equation.
- 
= 
A. {48} B. {29} C. {12} D. {-12}
Mathematics