John likes to watch the birds in her yard. one morning, she noticed that there are twice as many robbins as blue jays. she counted 21 blue jays and robin in all, how many blue jays did she count?

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Josephine has a great garden with and area of 2x2 + x - 6 square feet

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?