Find the values of b such that the function has the given maximum value . I already have it in vertex form as but I don't know what to do from here

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Write 17/20 as a decimal and as a percent.

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000