Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.
+ 
+ 
+ . . . + 
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Simplify the expression by combining like terms. 21.5y + 6.1 - 11.6y - 16.8
A. 10.9x - 10.7 B. -0.8x C. 9.9x + 10.7 D. 9.9x - 10.7
Mathematics
Write the complex number in trigonometric form, using degree measure for the argument.-1.06 + 8.62i
A. 8.7(cos 7.0° + i sin 7.0°) B. 8.7(cos 187.0° + i sin 187.0°) C. 8.7(cos -83.0° + i sin -83.0°) D. 8.7(cos 97.0° + i sin 97.0°)
Mathematics
Multiply. Write the answer in simplest form.3
× 5 × 
A. 4
B. 15
C. 15
D. 8
Mathematics
Solve the problem.Police use the formula s = S 
, where S is the test-car speed and L is the test-skid length, to find the actual speed s in an accident which left a skid mark of length l. Simplify the expression S 
by rationalizing the denominator.
A. 
B. 
C. 
D. S 
Mathematics