Work out length AC.

10 cm
120°
7 cm

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Hey hotel charges guests $19.75 a day to rent five video games at this rate which expression can be used to determine the charge for renting nine video games for one day at this hotel? pls