Write the English phrase as an algebraic expression. Let the variable x represent the number.Seven times a number, increased by eight
A. 7x - 8
B. 7 + 8x
C. 7x + 8
D. 7x + 56
Answer: C
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Add or subtract. Simplify the answer.
+ 
A. 
B. 
C. 
D. 
Find the mean. If necessary, round to one decimal place.1.4, 0.7, 0.9, 1.4, 0.5, 1.6, 0.5, 1.7, 2.1
A. 10.8 B. 1.2 C. 1.3 D. 1
Solve the problem.The following graph shows the private, public and total national school enrollment for students for select years from 1970 through 2000.
i) How is the graph for total school enrollment, T, determined from the graph of the private enrollment, r, and the public enrollment, u?ii) During which 10-year period did the total number of students enrolled increase the least?iii) During which 10-year period did the total number of students enrolled increase the most?
A.
| i) | T is the sum of r and u. |
iii) 1990-2000
B.
| i) | T is the difference of r and u. |
iii) 1990-2000
C.
| i) | T is the sum of r and u. |
iii) 1970-1980
D.
| i) | T is the sum of r and u. |
iii) 1980-1990
Solve the problem.Assume that the half-life of Carbon-14 is 5700 years. Find the age (to the nearest year) of a wooden axe in which the amount of Carbon-14 is 30% of what it originally had.
Fill in the blank(s) with the appropriate word(s).