“I am three years younger than my brother, and I am 2 years older than my sister. My mom's age is one less than three times my brother's age. When you add all our ages, you get 87. What are our ages?” ANSWER:
87 = x+Mom + sister + brother
87 = + (3brother-1) + (x - 2) + (x + 3)
87 = x+ (3*(x+3) - 1) +( x - 2) + (x + 3)
87 = x + 3x + 9 - 1 + x - 2 + x +3
87 = 6x + 9
78 = 6x
13 = x

what graph

step-by-step explanation:

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.

answer:   c ?

step-by-step explanation: