SOLUTION: The time necessary T to make an enlargement of a photo negative varies directly as the area of the enlargement. If 108 seconds are required to make a 3-by-4 inch enlargement, find
Algebra.Com
Question 22890: The time necessary T to make an enlargement of a photo negative varies directly as the area of the enlargement. If 108 seconds are required to make a 3-by-4 inch enlargement, find the time required to make a 6-by-8 inch enlargement.
A. 384 seconds
B. 528 seconds
C. 480 seconds
D. 432 seconds
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Step 1: Write an equation relating the variables using k for a constant:
T=kA
Step 2: Substitute one complete set of variables and solve for k:
T=kA
108 = k*12
Divide by 12:
Step 3: Use this value of k to answer the question about T.
The question is to find T when A= 6*8 = 48:
T=9A
T= 9*48
T= 432 seconds, which would be D.
R^2 at SCC
RELATED QUESTIONS
The time T necessary to make an enlargement of a photo of negative varies directly as the (answered by Boreal)
The time T necessary to make an enlargement of a photo negative varies directly as the... (answered by rfer)
The time T necessary to make an enlargement of a photo negative varies directly as the... (answered by edjones)
The time needed to make a photo enlargement varies jointly as its length and width. If it (answered by Boreal)
the height of a photo is 4 inches more than its width. After enlargement the height will... (answered by ankor@dixie-net.com)
A photograph that measures 5cm by 12cm is enlarged to a width of 7cm.... (answered by Cromlix)
The rules for a photo contest state that entries must have an area no greater than 100cm2 (answered by addingup)
A photo is measured to be 9 inches by 11 inches. A poster enlargement of the photo will... (answered by math_helper)
a rectangular original photo has a lenght of 15cm and 9cm in width. Find the width of the (answered by RoRo Jaxson)