The sum of the measures of the interior angles of the 5-sided house is 540 degrees Find the value of y.

72 degrees
18 degrees
54 degrees
90 degrees
36 degrees

  54 degrees

Step-by-step explanation:

The problem statement tells you the sum of measures:

  y +(2y) +(2y+4) +(2y+2) +(3y-6) = 540

  y(1 +2 +2 +2 +3) +(4 +2 -6) = 540 . . . collect terms

  10y = 540 . . . . simplify

  y = 54 . . . . . degrees

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.