Find the area.
A. 225 m2
B. 60 m2
C. 30 m2
D. 112.5 m2
Answer: A
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Add or subtract as indicated. Simplify, if necessary.
- 
A. - 
B. 
C. 
D. - 
In the current first-year class of a community college, all the students come from three local high schools. Schools I, II, and III supply respectively 40%, 50%, and 10% of the students. The failure rate of students is 4%, 2%, and 6%, respectively. Given that a student fails, what is the probability that he or she came from school I?
Fill in the blank(s) with the appropriate word(s).
Translate from English to an algebraic expression or equation, whichever is appropriate. Let the variable x represent the number.A number decreased by 
is half of that number.
A. x + 
= 
x
B. x - 
+ 
x
C. x = 
- 
x
D. x - 
= 
x
Solve the problem.In the consecutive chemical reaction, A1
A2 
A3 where k1 and k2 are rate constants, the amount A2(t) of substance A2 present at any time t is A2(t) = - 2.2
, 
Assuming that time is measured in minutes, determine within the first 60 minutes the intervals in which A2 is increasing and decreasing.
A. A2 is increasing during the first 50.0 minutes and decreasing from 50.0 to 60 minutes. B. A2 is increasing during the first 38.1 minutes and decreasing from 38.1 to 60 minutes. C. A2 is increasing during the first 34.7 minutes and decreasing from 34.7 to 60 minutes. D. A2 is decreasing during the first 34.7 minutes and increasing from 34.7 to 60 minutes.