What is the formula to find the 99th Triangular Number?

What formula do you use to find the x-coordinate of the vertex of a quadratic equation A) x = 2a/b...

What formula do you use to find the x-coordinate of the vertex of a quadratic equation?(1 point) Re...

Using the formula to find the area of a regular polygon, what is the area of a regular 15 sided poly...

Which formula is used to find the area of a circle when given the radius?(1 point) Responses A=π...

What is the formula to find one interior angle of a regular polygon?(1 point) Responses (n−2)...

What is the formula to find one exterior angle in a regular polygon?(1 point) Responses (n−2)180...

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