You have $325.10 in your savings account. This amount is $152.38 more than you had in your account yesterday? How much did you have in your account yesterday?

WRITE PROBLEM TO AN EQUATION. SOLVE AND CHECK. SHOW WORK PLEASE.

325.10 = x + 152.38; x = $172.72  

Step-by-step explanation:

1. Set up the equation

                     Let x = amount in account yesterday

Then x + 152.38 = $152.38 more than in account yesterday  

         and 325.10 = x + 152.38

2. Solve the equation

3. Check

OK

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.