Natural gas is a common fuel for what types of vehicles?
A. NASCAR
B. semi-trucks
C. fleet
D. sedans
Answer: C
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An investor has $100 to invest, and two investments between which to divide it. If she invests the entire amount in the first investment, her return will be X, while if she invests the entire amount in the second investment, her return will be Y. Both X and Y have mean $6 and standard deviation (risk) $3. The correlation between X and Y is 0.3.
a. Express the return in terms of X and Y if she invests $30 in the first investment and $70 in the second.
b. Find the mean return and the risk if she invests $30 in the first investment and $70 in the second.
c. Find the mean return and the risk, in terms of K, if she invests $K in the first investment and $(100–K) in the second.
d. Find the value of K that minimizes the risk in part (c).
e. Prove that the value of K that minimizes the risk in part (c) is the same for any correlation 
with?1.
The refrigerant R-22 in a system component has a pressure of 70 psig and a temperature of 50°F. Is it saturated, superheated, or subcooled?
What will be an ideal response?
?____ stainless steels tend to be brittle unless specially deoxidized.
A. ?Ferritic B. ?Austenitic C. ?Martensitic D. ?Precipitation hardening
A ____ is a group of one or more genera that share a set of underlying features
a. subspecies c. family b. variety d. species