Why is the value of 3x squared + 5xy always an even number if x and y are both odd numbers?

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.