Val buys a computer for $920. if this is 115% of what the store paid for the same computer, how much did the store earn on the sale?

Hi!

We will solve this using rations, like this:

$920 equals to 115% = 1,15

$x equals to 100% = 1

x = (920*1)/1,15

x = 920/1,15

x = 800

Store earned 15%, or in this case 920 - 800 = $120.

Hope this helps!

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.

18.75 gallons

step-by-step explanation: