If you reduce a twelve times a number by 40, you get the same number as if you increase its seven times by 25. What number is that?

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

With these 5 geometry questions! pls 1.)quadrilateral abcd is inscribed in this circle.what is the measure of ∠a ? enter your answer in the box.°2.)quadrilateral abcd is inscribed in a circle.what is the measure of angle a? enter your answer in the box.m∠a= 3.)quadrilateral abcd is inscribed in this circle.what is the measure of angle b? enter your answer in the box.m∠b= °4.)quadrilateral abcd is inscribed in this circle.what is the measure of angle a? enter your answer in the box.°5.) quadrilateral abcd is inscribed in this circle.what is the measure of angle c? enter your answer in the box.°

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me