Idon't understand what the "! "s mean.

n! is called a factorial.

It would look something like this: n! = 1·2·3·...·n

An example:

5! = 1·2·3·4·5 = 120

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

actually your concept is wrong

step-by-step explanation:

150% of x =300

150x=300×100

x=(300×100)÷150

x=200