Please solve this problem

(3) When two electrical resistors with resistance R1 > 0 and R2 > 0 are wired in parallel in a circuit, the combined resistance R, measured in ohms (Q), is given by l_i+i R _ R1 R2 (a) Find 3]: and 5}: after solving for R (e.g., R = ....) (b) Describe how an increase in R1 with R2 held constant affects R. (Will R increase or decrease?) (c) Describe how a decrease in R2 with R1 held constant affects R. (Will R increase or decrease?)