# Examples for secondary school students

#### Number of problems found: 3887

- Harmonic HM example

Find the harmonic mean of 4 and 8. - Derivation

Exists a function whose derivation is the same function? - Complex conjugate

What is the conjugate of the expression 5√6 + 6√5 i? A.) -5√6 + 6√5 i B.) 5√6 - 6√5 i C.) -5√6 - 6√5 i D.) 6√5 - 5√6i - Im>0?

Is -10i a positive number? - Insert 4

Insert three arithmetic means between 3 and 63. - Reference angle

Find the reference angle of each angle: - Logarithm

Determine the number whose decimal logarithm is -3.8. - What is 25

What is the trunk of 8 and 10? - Multiples of eight

Find the sum of the first 25 multiples of 8. - C(6,3)

C(6,3) + 3 P(6,3) - Scalar product

Calculate the scalar product of two vectors: (2.5) (-1, -4) - Value

Find the value of the expression: 6!·10^{-3} - Reciprocal

Calculate the reciprocal of z=0.8-1.8i: - Discriminant

Determine the discriminant of the equation: 7x²-x+7=1 - The determinant

The determinant of the unit matrix equals 7. Check how many rows the A matrix contains. - Calculation

How much is the sum of the square root of six and the square root of 225? - Determine 4314

Find the rank of each null matrix. - Solve 6

Solve the following equations: x + 2y - z = 3 3x + 4y + z = 5 3x - y - z = 5 - Harmonic 4

Find the harmonic mean of -6 and 5. - Harmonic mean

Harmonic means of 6 and 12

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