2x+3x+4x=180
9x=180
x=20

how did they get 20, am i missing something

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00

Is there an x intercept in the equation 60*1.15^x

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.