# Tutor profile: Uche O.

## Questions

### Subject: SQL Programming

Given 2 Tables, Table A with columns s_id,name,country and Table B s_age_id,s_id,age Join the two data sets together on their common columns s_id. Use aliases (a, b) to denote Table A and Table B respectively.

Select a.s_id,a.name,a.country,b.s_age_id,b.s_id,b.age FROM TABLE A as a INNER JOIN TABLE B as b ON a.s_id =b.s_id

### Subject: Calculus

function f(x) = 3 +5x - 2x^2 Find f'(x)

Following differentiation rules where f'(x) = nx^(n -1) where n = degree of polynomial of x f'(x) = 5 -4x

### Subject: Electrical Engineering

Calculate the general current flowing through a closed loop circuit with a source voltage of 20V and two parallel 5ohm resistors.

Using ohm's law (V= IR) where V = voltage, I = current and R = total resistance. in this case since the Resistances in the circuit are in parallel the total resistance = ((5x5)/(5+5)) = 2.5 ohms Therefore current(I) through the circuit = 20/2.5 = 8Amps

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