Approximate the area under the curve and above the x-axis using n rectangles. Let the height of each rectangle be given by the value of the function at the right side of the rectangle.f(x) = 2x2 + x + 3 from x = -2 to x = 1; n = 6
A. 9
B. 7
C. 13
D. 11
Answer: C
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At age 25 you start to work and are offered two retirement options.
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Retirement option 1: When you retire, you receive a lump sum of $25,000 for each year of service.
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Retirement option 2: When you start to work, the company will deposit $10,000 into an account that pays a yearly compound interest rate of 13%.
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A: Write a formula that gives your retirement payment 
, in dollars, if you retire after t years of service under retirement option 1.
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B: Write a formula that gives your retirement payment 
, in dollars, if you retire after t years of service under retirement option 2.
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C: Make a graph that shows the retirement payment for each option over the 40 years of service.
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D: How many years of service will result in the same payment from either option? (You will work more than 1 year.) Round your answer to two decimal places if necessary.
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What will be an ideal response?
The quantity demanded each week x (in units of a hundred) of the Mikado miniature camera is related to the unit price p (in dollars) by the demand equation 
.
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Is the demand elastic or inelastic when 
?
?
__________
?
Is the demand elastic or inelastic when 
?
?
__________
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When is demand unitary? If it is necessary round the answer to two decimal places.
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Hint: Solve 
for p.
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p = __________
?
If the unit price is lowered slightly from $18, will the revenue increase or decrease?
?
__________
?
If the unit price is increased slightly from $24, will the revenue increase or decrease?
?
__________
What will be an ideal response?
Use the commutative and/or associative laws to rewrite the given expression. Label each step with a reason.(x + 9) + 9 as 18 + x
What will be an ideal response?
Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.32 + 63 + 94 + . . . + 249
A. 
B. 
C. 
D. 