Acircle centered at (–1, 2) has a diameter of 10 units. amit wants to determine whether (2, –2) is also on the circle. his work is shown below. the radius is 5 units. find the distance from the center to (2, –2). the point (2, –2) doesn’t lie on the circle because the calculated distance should be the same as the radius. is amit’s work correct? no, he should have used the origin as the center of the circle. no, the radius is 10 units, not 5 units. no, he did not calculate the distance correctly. yes, the distance from the center to (2, –2) is not the same as the radius.

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.