Without graphing, determine whether the graph of the quadratic function opens up or opens down.f(x) = -7x2 - 3x + 5
A. opens down
B. opens up
Answer: A
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Solve the problem.A certain radioactive isotope decays at a rate of 0.1% annually. Determine the half-life of this isotope, to the nearest year.
A. 301 yr B. 7 yr C. 693 yr D. 500 yr
Use power series operations to find the Taylor series at x = 0 for the given function.f(x) = x7 cos ?x
A. 
B. 
C. 
D. 
Find 
. Write your answer in standard polar form with the argument in radians.z1 = 
, z2 = 
A. 
B. 
C. 
D. 
Solve the problem.During a sale, a store sells red-dot items at a 30% discount and yellow-dot items at a 10% discount. A shopper bought red- and yellow-dot items with a combined regular price of $44.00. If the total discount was $8.00, how much did the shopper spend on each kind of item?
A. Red-dot items: $26 Yellow-dot items: $18 B. Red-dot items: $18 Yellow-dot items: $26 C. Red-dot items: $12.60 Yellow-dot items: $23.40 D. Red-dot items: $23.40 Yellow-dot items: $12.60