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

how did they get 20, am i missing something

Multiply. −2x(6x4−7x2+x−5) express the answer in standard form. enter your answer in the box.

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

X+ y = 5 ; x - y =3 solve using linear combination