If y varies directly as x, and y us 400 when y is r and x is 4 what is the numeric constant of variation in this relation

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

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

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.