I need help, i don’t understand it and my teacher didn’t explain it well. What is needed on the chart? How do i find the midpoint?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

The gdp is $1,465.2 billion. the population is 249,793,675. find the per capita gdp.