Regular practice will keep your math skills always at their best. Continue to keep your math skills strong by practicing this week’s brain buster from Geometry!

## An isosceles triangle has a base of 1-1/3 feet and an area of 48in^{2}, what is the perimeter measured in inches?

** **

A) 160

B) 36

C) 48

D) 100

E) None of the above

Stay tuned next week for the solution!

## Solution for last week’s Math Madness question:

x + 8y = 10 4x + 8 = 4(y+3) FIRST, SOLVE FOR “x” OR “y” (I CHOSE “x”)

-8y -8y

x = 10 – 8y

4(10-8y) + 8 = 4(y+3) THEN SUBSTITUTE WHATEVER YOU SOLVED FOR

40 – 32y + 8 = 4y + 12 AND SIMPLIFY – SOLVE FOR THE REMAINING “x” OR “y”

+32y +32y (I WOULD NOW SOLVE FOR “y”)

40 + 8 = 36y + 12

48 = 36y + 12

-12 -12

36 = 36y

/36 /36

1 = y

SOLVE FOR THE REMAINING “x” OR “y”

x = 10 – 8y GO BACK TO FIRST EQUATION

x = 10 – 8(1) SUBSTITUTE AND SIMPLIFY

x = 10 – 8

x = 2

x = 2; y = 1

BACK TO THE ORIGINAL QUESTION:

what is xy? SUBSTITUTE

(2)(1) MULTIPLY

2 THE PRODUCT