Subtract.(28x + 16xy - 21y) - (13x - 6xy - 26y)
A. 12x - 15xy + 47
B. 15x - 22xy - 47y
C. 42xy
D. 15x + 22xy + 5y
Answer: D
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Solve the problem.A sports shop sells tennis rackets in 3 different weights, 3 types of string, and 4 grip sizes. How many different rackets could they sell?
A. 24 B. 36 C. 10 D. 27
Express the equation in exponential form.log 4 16 = 2
A. 24 = 16 B. 42 = 16 C. 162 = 4 D. 416 = 2
A radioactive substance decays at a rate directly proportional to the amount present. If the substance is present in the amount of 
g initially 
, find the amount present in grams at any time
src="https://sciemce.com/media/3/ppg__cognero__9.1_Differential_Equations__media__5d84b819-b3a8-4116-91be-87875b418c09.PNG" style="vertical-align: middle;" />. Formulate but do not solve the problem in terms of a differential equation with a side condition. What will be an ideal response?
Solve the problem.The number of bacteria growing in an incubation culture increases with time according to 
where x is time in days. Find the number of bacteria when 
and 
.
A. 2400 bacteria; 36,000 bacteria B. 7200 bacteria; 583,200 bacteria C. 2400 bacteria; 583,200 bacteria D. 2400 bacteria; 64,800 bacteria