Can someone please help me?

 represents the line of best fit for the scatter plot. The graph of is also attached below.

Step-by-step explanation:

Considering the equation

so,

so,

Thus,

also

Therefore,  represents the line of best fit for the scatter plot.

The graph of is also attached below. From the graph, it is clear that it very much fits for the scatter plot.

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

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.