What is the answer to this question because i don't know9n-4=

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (-4, 0) and (6,0). the y-intercept of thefirst parabola is (0, –12). the y-intercept of the second parabola is (0-24). what is the positive difference between the avalues for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth.