It is time my friends...please help me with this image that has haunted me

C, 7 1/2

Step-by-step explanation:

12 is 2/3 of 18, therefore 5 is 2/3 of something, so you divide 5 by 2/3 which is 15/2 which is 7 1/2

C

7 and 1/2"

Step-by-step explanation:

First, let's figure out what 12 is being multiplied by to get 18. To do this, we divide 18 by 12. We get 1.5. Now, to find x we multiply 5 by 1.5.

5 times 1.5 = 7.5 (AKA 7 and 1/2)

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: your answer is c

step-by-step explanation: