Jethro has sat 5 tests. Each test was marked out of 100 and Jethro’s mean mark for the 5 tests is 74Jethro has to sit one more test that is also to be marked out of 100Jethro wants his mean mark for all 6 tests to be at least 77Work out the least mark that Jethro needs to get for the last test.​

x² + 11x + 18 < 0  

[-11 ± sqrt(121 - 72)]/2 = (-11 ± 7)/2  

solution: (-9, -2)

step-by-step explanation:

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).

answer: $1794

step-by-step explanation: