Which expressions are equivalent to the given expression? y^-8y^3x^0x^-2

1.) x^-2y^-5

2.) 1/y^24

3.) x^2y^-11

4.) x^2/y^11

5.) y^-24

6.) 1/x^2y^5

I hope this makes sense but I don’t understand it

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.°