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Q 1 / 3

What is 25% of 200?

0/18

25% means "25 out of every 100." So for 200, do (25/100) × 200 = 50. Another way to think about it: 25% is one quarter, and 200 ÷ 4 = 50.

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13/20

In a chemical reaction, which factor does NOT affect the rate of reaction?

Temperature

Catalyst

Color of reactants

Concentration

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CHAPTER 4Grade 12 - LS

Differential Equations

A first-order equation like dy/dx = ky is solved by separating the variables.

Key idea

Move everything with y to one side and everything with x to the other — then integrate both sides.

Worked example

1Separate: dy/y = k dx
2Integrate: ln|y| = kx + C
3Solve: y = Ae^(kx)

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Can you explain how to find the limit of a function as x approaches infinity?

To find the limit as x → ∞:

Divide numerator and denominator by the highest power of x
As x → ∞, terms like 1/x → 0
Simplify the remaining expression

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