William went to the grocery store and bought 8 lbs of ground beef at a discounted price. he gave the cashier two 20 dollar bills, and she gave him $7.12 in change. what was the price per pound of ground beef?

The beef was $4.11 per pound

Step-by-step explanation:

take $40 (how much he paid with) minus $7.12 ( how much he got back) to find out how much he paid for the meat - $32.88. Then divide that by 8 to find price per pound. 32.88/8 = 4.11

4.11

Step-by-step explanation:

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

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.