Can someone answer these three questions?

7 is C this is because if you pluge the x value into the equation and it gives you the y value associated with it for all the points, then it is the correct equation.

8 is A and this is the same principle

9 is C because b = 6h-3 and put this in the equation for a triangle and you get 1/2 (6h-3)h and put into one equation is (6h^2 - 3h)/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.