Atriangle has an area of 110 square inches and a base of 15 inches which answer best pinpoints the height

Remember! The formula for Area of a Triangle is: 
A = (1/2)bh

Where b is the length of the base, and h is the length of the height. 

We were given b, the base is 15 inches. And the area is 110 square inches. 

So we can plug those into the equation: 

110in^2 = (15in * X)/2

Multiply both sides by 2.

110in^2 * 2 = (15in * X)/2 * 2 

Simplify!: 

220in^2 = 15in * X

Divide both sides by 15in.

220in^2 / 15in = (15in * X) / 15in

220/15 = 14.66...

So we're left with the in^2 and in canceling out to leave: 

14.66in = X

So our height is: 
14.66in

So, it will be the answer choice d.

The answer will be 14.66 because you need to multiply 110 by 2 and then divide by 15, which will be 14.66666

3x+9+4x+x=8x+9that's the answer for your question.