# Tutor profile: Essa H.

## Questions

### Subject: Biology

Communication in the human endocrine system can occur via electrical or chemical signals. What type of signal (fast or slow) does each communication method have, and what is the resulting target response because of the type of signal?

Electrical Signals: Signal is fast but last only short time. Target response is very fast (milliseconds) and short lived. Chemical Signals: Signal is slow but last long time. Target response is slow but lasts longer (seconds, minutes, or even days).

### Subject: Calculus

Take the derivative of the following with respect to x, then take the integral of the derivative with respect to y. x = y*(x^2) + 2*z + 5x + 10

Step 1: Clean up equation 0 = y*(x^2) + 2*z + 4x + 10 Step 2: Take derivative 0 = 2*y*x + 4 Step 3: Take integral 0 = (y^2)*x + 4*y + Constant

### Subject: Physics

Three resistors (R1, R2, R3) are connected in series to each other in circuit 1. Three capacitors (C1, C2, C3) are connected in parallel to each other in circuit 2. What is the equivalent resistance for circuit 1 and the equivalent capacitance for circuit 2?

Equivalent Resistance of Circuit 1: R1 + R2 + R3 = Rx Equivalent Capacitance of Circuit 2: C1 + C2 + C3 = Cx

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