A picture is 5 inches wide and 8 inches tall:

A rectangle is shown. The length of the rectangle is labeled 5 inches. The width of the rectangle is labeled 8 inches.

A photographer wants to use a scale factor of 2.5 to enlarge a picture. What will the area of the picture be after it is enlarged?

40 in2
250 in2
100 in2
81.9 in2

Question

A picture is 5 inches wide and 8 inches tall:

A rectangle is shown. The length of the rectangle is labeled 5 inches. The width of the rectangle is labeled 8 inches.

A photographer wants to use a scale factor of 2.5 to enlarge a picture. What will the area of the picture be after it is enlarged?

40 in2
 250 in2
 100 in2
 81.9 in2

anonymous · Answer

attachment

johnweldon1993 · Answer

Hey :P

Remember yesterday where I said if the scale factor were 2...it would mean double the size? *or multiply the values by 2?

So if the scale factor is 2.5...what would we do?

anonymous · Answer

we multiply? 2.5

johnweldon1993 · Answer

We multiply each side length by 2.5 right?

Not just the area

|dw:1447339349128:dw|

anonymous · Answer

Right yes! :)

johnweldon1993 · Answer

So what dimensions would we have now?

What is 8 times 2.5?
And what is 5 times 2.5?

anonymous · Answer

12.5 and 20

johnweldon1993 · Answer

Right

|dw:1447339474008:dw|

Meaning our area is now...?