Find v1 and v2 of a summing amplifier when it is in series with another Op-Amp
Supposedly the operation of this circuit is v0= 3v1 + 1.5v2, but I don't know what that means.


This means that you should be able to calculate the output voltage from the two input voltages using algebra, according to the given formula.

If you work out the circuit, you will find a formula that gives \$v_o\$ in terms of \$v_1\$, \$v_2\$, \$R_1\$, \$R_2\$, \$R_{f1}\$, and \$R_{f2}\$. Your job is to find values of the resistors that makes the constants in the formula come out to 3 and 1.5.