Translate into an equation, then solve.Bob is saving to buy a car. The total amount that he needs is $11,000. The amount that he has saved so far is $7000. How much more does Bob need?
A. 7000 + x = 11,000; Bob needs $4002 more.
B. 7000 - x = 11,000; Bob needs $4000 more.
C. 7000 + x = 11,000; Bob needs $4000 more.
D. 7000 - x = 11,000; Bob needs $4002 more.
Answer: C
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Find an equation of a parabola satisfying the given conditions.Find the equation of the parabola with vertex at the origin and axis along the y-axis if the parabola passes through the point 
A. x2 = -16y
B. y2 = 16x
C. x2 = 
y
D. y2 = 80x
Find the missing length in the right triangle. If necessary, round to the nearest tenth.
A. 9.2 mi B. 8.5 mi C. 85 mi D. 42.5 mi
Solve the problem.The Richter scale magnitude R of an earthquake is based on the features of the associated seismic wave and is measured by R = log (a/T) + B, where a is the amplitude in ?m (micrometers), T is the period in seconds, and B accounts for the weakening of the seismic wave due to the distance from the epicenter. Compute the earthquake magnitude R when a = 320, T = 5, and B = 3.5. (Round to the nearest ten-thousandth.)
A. 1.8062 B. 8.8062 C. 1.6938 D. 5.3062
Multiply.
? 
A. 
B. 
C. 
D. 73z