Write the expression in the standard form a + bi.7i(6 - 4i)
A. 28+ 42i
B. 42i + 28i2
C. 42i - 28i2
D. 42i- 28
Answer: A
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Fill in the digits for the given place values in the following whole number.89,438ten-thousands 
hundreds 
A. ten-thousands: 8, hundreds 4 B. ten-thousands: 3, hundreds 4 C. ten-thousands: 8, hundreds 9 D. ten-thousands: 9, hundreds 8
Determine whether the following rule defines y as a function of x.y = 
A. Function B. Not a function
Provide an appropriate response.While solving an equation, why can't you multiply both sides of the equation by zero?
What will be an ideal response?
Solve the problem.A company's total cost, in millions of dollars, is given by C(t) = 300 - 30e-t where t = time in years. Find the marginal cost when t = 2.
A. 40.6 million dollars per year B. 4.06 million dollars per year C. 2.99 million dollars per year D. 8.12 million dollars per year