Above are two different models of the same rectangular patio. If the area of the model on the left is 4 sq cm, what is the area of the model on the right?
A.
29 sq cm
B.
20 sq cm
C.
100 sq cm
D.
40 sq cm

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

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: you need the equation in the question so i can answer it

step-by-step explanation: