Ihave a table showing proportional relationships and it's asking for the missing y-value.

x 4 10 12
y 6 15 ?

i don't know how to find ?

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10