Simplify.
A. 90
B. 6
C. 15
D. 23
Answer: B
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Evaluate the integral.
dx
A. 
+ C
B. -esin-1 x + C
C. ecos-1 x + C
D. 
+ C
Simplify and add or subtract wherever possible.
+ 
- 
A. 15
B. 15
C. 205
D. -280
Arrange the polynomial in descending powers of the variable. Then find its degree and leading coefficient.7x - 8x5 - 1
A. 7x - 8x5 - 1, degree 6, leading coefficient: 7 B. -8x5 + 7x - 1, degree: 6, leading coefficient: -8 C. 7x - 8x5 - 1, degree 7, leading coefficient: 7 D. -8x5 + 7x - 1, degree: 5, leading coefficient: -8
The sizes of two matrices are given. Find the size of the product AB and the size of the product BA, if the given product can be calculated.A is 1 × 4; B is 1 × 4.
A. AB is 4 × 1; BA is 1 × 4. B. AB is 1 × 4; BA is 4 × 1. C. AB is 1 × 1; BA is 4 × 4. D. AB cannot be calculated; BA cannot be calculated.