Finding slope intercept

Which shows one way to determine the factors of  x3  +  5x2  –  6x  –  30 by grouping? x(x2  –  5)  +  6(x2  –  5)x(x2  +  5)  –  6(x2  +  5)x2(x  –  5)  +  6(x  –  5)x2(x  +  5)  –  6(x  +  5)

Weak battery is considered to be a part of routine a. inspection b. wear and tear c. maintenance d. check

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m