In a newspaper, it was reported that the number of yearly robberies in Springfield in 2011 was 138, and then went up by 50% in 2012. How many robberies were there in Springfield in 2012?

207 robberies

Step-by-step explanation:

To find 50% of a number, we will simply multiply that number by 50%. To do so, we first convert 50% to a decimal.

When converting a percent to decimal, simply add a decimal point to the end of the number, then move it 2 places to the left.

50.  →  .50

Now we multiply:

138 x .50 = 69

So we know that 50% of 138 = 69

Now we just add that number to our original number in order to find what it would be with a 50% increase

138+ 69 = 207

So there were 207 robberies in 2012

reflections:

1) about the y-axis

2) about the line y = 1

Step-by-step explanation:

CD = AD = sqrt(17) = GH = HE

AB = BC = sqrt(5) = EF = FG

So, ABCD & EFGH are congruent rectangles

This is a combination of 2 reflections:

1) about the y-axis

2) about the line y = 1