Can someone simplify this for me? 63 ÷ 3 2 + |2|

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

What is the length of the segment, endpoints of which are intersections of parabolas y=x2? 11 4 x? 7 4 and y=? 7 8 x2+x+ 31 8 ?

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =