Find the volume

pls show your work
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What signals you that factoring by grouping is the best method to use when factoring a problem?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.