At a bake sale, the cost, C or buying n pies is C = 7n. If one customer buys $84 worth of pies, how many did they buy? Use proper solution form.

C = 7n

fill in the missing numbers and you get

84 = 7n

which means you can divide 84 by 7 to get n

84/7 = n

n = 12

12

12 pies

Step-by-step explanation:

C=7n

C=7(12)

C=84

Customer bought 12 pies

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.