Please help i'm getting bad grade and i need to improve or i will repeat

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.

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?