Find 
.y =log7
A. 
B. 
C. e7
D. 
Answer: A
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?In the following shape, the Surface Area of the top rectangular solid is 1/4 of the bottom surface area. What is the ratio of Volume of the top rectangular solid to the Volume of the bottom rectangular solid?
?
A. ?1/4 B. ?1/2 C. ?1/8 D. ?1/16 E. ?1/32
Find the gradient field F of the function f.f(x, y, z) = z sin (x + y + z)
A. F = -cos xi - cos yj + (sin z - z cos z)k B. F = -z cos(x + y + z)i - z cos(x + y +z)j + (sin(x + y + z) - zcos(x + y + z))k C. F = cos xi + cos yj + (sin z + z cos z)k D. F = z cos(x + y + z)i + z cos(x + y +z)j + (sin(x + y + z) + zcos(x + y + z))k
Perform the indicated operations and simplify the result. Leave the answer in factored form.- 
- 
A. 
B. 
C. 
D. 
Solve.The annual depreciation rate r (0 < r < 1) of a car purchased for P dollars and worth A dollars after t years can be modeled by the following formula: 
Find the depreciated value of a car 4 years after it is purchased new for $34,000 if the depreciation rate is 19%. Round your answer to the nearest dollar.
A. $27,540 B. $14,636 C. $6460 D. $44