If 30 pencils cost $15. How much does 45 pencils cost ? *

This is different from the first one can someone me

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?