Solve.Find two numbers whose sum is 40 and whose product is as large as possible. [Hint: Let x and 
be the two numbers.Their product can be described by the function 
A. 
and 
B. 20 and 60
C. 19 and 21
D. 20 and 20
Answer: D
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Solve the problem.A voltage source of 12 volts can supply a voltage V (in volts) through a 72-ohm line to a variable resistance R (in ohms) given by the following equation. V = 
. How fast does V change with respect to R when R is 67 ohms?
A. 0.167 V/? B. 0.045 V/? C. 0.192 V/? D. 6.216 V/?
Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation.3x2 - 5x ? 8
A. (-?, -1] ?
B. (-?, -1) ? 
C. 
D. 
Multiply the polynomials using the special product formulas. Express the answer as a single polynomial in standard form.(8x - 7)2
A. 64x2 + 49 B. 8x2 - 112x + 49 C. 8x2 + 49 D. 64x2 - 112x + 49
Do the operation and express the answer in a + bi form.
?
?
A. - 8 + 14i B. 8 + 7i C. - 8 + 7i D. - 8 - 7i E. 8 - 7i