Find the perimeter. Simplify your answer.
6a-5
a+1
a+1
6a-5

2(6a - 5) + 2(a + 1) =

= 12a - 10 + 2a + 2 =

= 12a + 2a - 10 + 2 = 14a - 8

14a-8

Step-by-step explanation:

A perimeter is the sum of the length of each side. So we can find the perimeter by adding: (a+1)+(a+1)+(6a-5)+(6a-5).

Combine like terms to get: 14a+2-10 = 14a-8.

Without knowing what a is, the perimeter is 14a-8.

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.