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# Tutor profile: Noshin K.

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Noshin K.
Recent Environmental Engineering Graduate from the University of Michigan
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## Questions

### Subject:Spanish

TutorMe
Question:

In what contexts are \$\$ ser \$\$ and \$\$ estar \$\$ used?

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Noshin K.

\$\$ser\$\$ is used when referring to the date, an occupation, characteristics, time, origin, and relation \$\$estar\$\$ is used when referring to position, location, action, condition, and emotion

### Subject:Environmental Engineering

TutorMe
Question:

A reactor at a drinking water plant has two inputs with the following flowrates and concentrations of chloride: Input 1: flowrate = \$\$1 m^3/s\$\$ chloride concentration = \$\$15.0 mg/L\$\$ Input 2: flowrate = \$\$3 m^3/s\$\$ chloride concentration = \$\$50 mg/L\$\$ Assume chloride is a conservative substance, the reactor volume does not change, and the reactor is well-mixed. Find the chloride concentration in the single output leaving the reactor.

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Noshin K.

Assumptions: steady state well mixed - completely mixed-flow reactor --> \$\$ C_(reactor) = C_(out) \$\$ \$\$ dV/dt = dM/dt = 0 \$\$ conservative (no reaction) --> \$\$ rV = 0 \$\$ \$\$ dV/dt = Q_1 + Q_2 - Q_(out) = 0 \$\$ \$\$Q_1 = 1 m^3/s \$\$ \$\$Q_2 = 3 m^3/s \$\$ \$\$ Q_1 + Q_2 = Q_(out) = 4 m^3/s \$\$ \$\$ dM/dt = QC_(in) - QC_(out) + rV \$\$ \$\$ rV = 0 \$\$ \$\$ dM/dt = 0 \$\$ \$\$ dM/dt = Q_1C_1 + Q_2C_2 - Q_(out)C_(out) = 0\$\$ \$\$C_1 = 15.0mg/L\$\$ \$\$C_2 = 50 mg/L\$\$ \$\$ C_(out) = (Q_1C_1 + Q_2C_2)/Q_(out) \$\$ \$\$ C_(out) = 41.25 mg/L\$\$ one significant figure -- \$\$ C_(out) = 40 mg/L \$\$

### Subject:Algebra

TutorMe
Question:

Given the equation \$\$ 8 + 5t = 9t - 12 \$\$ Solve for \$\$ t \$\$

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Noshin K.

\$\$ 8 + 5t = 9t - 12 \$\$ \$\$ 20 + 5t = 9t \$\$ \$\$ 20 = 4t \$\$ \$\$ t = 5 \$\$

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