In quadrilateral qrst, measures (5x + 15)o. angle tqr measures (4x + 3)o. what is the measure of angle rst? °

(Supposing angle RST measures 5x+15)Knowing that angle TQR is the opposite angle to RST the sum should be supplementary you can find the measures by adding the angle measurements.
5x+15+4x+3=180
9x+18=180
9x=162
18=x 
if you plug in the x to the measure of RST (5*18+15)=105
the measure of RST would be 105 degrees

The answer on e2020 is 105°

If jon had $4.00 then takes away $2.25, then he should have $1.75 left. $4.00 - $2.25 = $1.75 hope this ; )