Which of the following is not a grouping symbol?
a. Parentheses
b. Arrows
c. Bar
d. Braces
b. Arrows
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Find the slope of the polar curve at the indicated point.r = 7, ? = 
A. 1
B. - 
C. -
D. 0
Substitute to find the value of the expression.The area of a rectangle of length ? and width w is given by the formula A = ?w. Ann's backyard is rectangular with a length of 26.9 yards and a width of 18.8 yards. Find the area of Ann's backyard.
A. 45.7 yd2 B. 45.7 yd C. 505.72 yd2 D. 505.72 yd
Assume that the probability that an airplane engine will fail during a torture test is 
and that the aircraft in question has 4 engines. Find the probability that no engines will survive.
?
A. 
B. ?
C. ?
D. ?
E. ?
Write the expression in the standard form a + bi.If z = 9 + 3i and w = -7 + i, evaluate 
.
A. 2 + 4i B. 16 + 2i C. 16 - 2i D. -16 - 2i