Claudia’s skis are 150 cm long. how many meters is

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

I’m really confused and need your assist me with this question i’ve never been taught

Mallory has been offers two different jobs. she can baby sit for 6 hours a week and get $8.50 an hour. or she can work at the library for 14 hours a week and make $5.50 an hour. which job will allow her to save the most money after 6weeks?