Let 
, and evaluate the expression.
?
?
A. -9
B. -3
C. 3
D. -8
Answer: C
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Solve.The voltage across a resistor is jointly proportional to the resistance of the resistor and the current flowing through the resistor. If the voltage across a resistor is 
for a resistor whose resistance is 
and when the current flowing through the resistor is 
find the voltage across a resistor whose resistance is 
and when the current flowing
through the resistor is 
A. 30 volts
B. 10 volts
C. 48 volts
D. 12 volts
Simplify the expression. Assume that all variables are positive when they appear.10
- 4
+ 9
A. 30
B. -30
C. 24
D. 10
Combine like terms when possible and write the polynomial in descending powers of the variable. Give the degree of the simplified polynomial. Decide whether the simplified polynomial is a monomial, a trinomial, or none of these.10n9 - 15n9 + 5n6 + 3n9 - 11n6
A. -2n9 - 6n6; 9; binomial B. -8n15; 15; monomial C. Cannot be simplified D. -8n9; 9; monomial
Divide. Write the answer in lowest terms.
÷ 
A. 
B. 
C. 
D. 