Provide an appropriate response.Suppose you want to solve the following problem. A teacher can grade 7 essays in 2 hours. At this rate, how many essays will she be able to grade in 5 hours? Which of the following proportions will give the correct answer?(i) 
= 
(ii) 
= 
(iii) 
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(iv) 
= 
A. (iii) only
B. (ii) and (iv)
C. (i) and (iv)
D. (i) only
Answer: C
Mathematics
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Find the perimeter.
A. 89 m B. 138 m C. 178 m D. 1960 m
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Evaluate the expression. Write your answer without negative exponents.-3-2
A. -9
B. 
C. - 
D. 9
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Convert the units using unit fractions.135 min = 
hr
A. 1350
B. 8100
C. 2
D. 2
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Find the LCM of each group of expressions.112, 96
A. 672 B. 224 C. 336 D. 1344
Mathematics