Solve.The time T necessary to make an enlargement of a photo negative is directly proportional to the area A of the enlargement. If 24 seconds are required to make a 3-by-4 enlargement, find the time required for a 4-by-9 enlargement.
A. 144 sec
B. 36 sec
C. 72 sec
D. 108 sec
Answer: C
Mathematics
You might also like to view...
Find the requested sum of the arithmetic sequence.
A. 52 B. 55 C. 21 D. 5
Mathematics
Write the word phrase as an algebraic expression. Use x to represent the unknown number.The quotient of a number and 4, decreased by 9
A. 
B. 
- 9
C. 
D. 
- 9
Mathematics
The given figure shows two similar triangles. Find the length of the side labeled "x".
A. 20 meters B. 26 meters C. 28 meters D. 35 meters
Mathematics
Fill in the blank with one of the words or phrases listed below. 
Two angles that have a sum of 180° are called 
angles.
A. straight B. obtuse C. supplementary D. complementary
Mathematics