Factor by grouping.20a3 - 25a2b - 16ab2 + 20b3
A. (4a - 5b)(5a2 - 4b2)
B. (4a + 5b)(5a2 - 4b)
C. (4a - 5b)(5a2 - 4b)
D. (4a + 5b)(5a2 + 4b2)
Answer: A
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If a triangle has vertices of 
and 
then the area of the triangle is given by 
Find the area of the triangle with vertices at the given points.(-4, -4) (1, 4) (4, 2)
A. 34 B. 52 C. 26 D. 17
Write the number in trigonometric form. Let 0 ? ? < 2?.5
A. 5(cos 
+ i sin 
)
B. 5(cos 
+ i sin 
)
C. 5(cos 0 + i sin 0)
D. 5(cos ? + i sin ?)
Either the dimensions of two matrices or the matrices themselves are given. Find the dimensions of the product AB and the product BA. If either is not defined, say so.A = 
; B = 
.
A. AB is 1 × 1; BA is not defined. B. AB is 1 × 1; BA is 2 × 2. C. AB is 2 × 2; BA is 1 × 1. D. AB is not defined; BA is 2 × 2.
Find the circumference of the circle. Use 3.14 or 
for ? as indicated.Find the circumference. Round the answer to the nearest tenth of a unit.
A. 17.3 ft B. 7.4 ft C. 14.8 ft D. 29.5 ft