# Examples for secondary school students

#### Number of problems found: 2059

- Equation 23

Find value of unknown x in equation: x+3/x+1=5 (problem finding x) - Sequence 3

Write the first 5 members of an arithmetic sequence: a_{4}=-35, a_{11}=-105. - 2nd class variations

From how many elements you can create 2450 variations of the second class? - Goniometric form

Determine goniometric form of a complex number ?. - Euclid2

In right triangle ABC with right angle at C is given side a=27 and height v=12. Calculate the perimeter of the triangle. - The gems

The jeweler selects 4 gems for the ring. It has rubies, emeralds and sapphires. How many options does he have? - Q-Exam

If tg α = 9.6, Calculating sin α, cos α, cotg α . - Dice

We throw 10 times a play dice, what is the probability that the six will fall exactly 4 times? - Word

What is the probability that a random word composed of chars E, Y, G, E, R, O, M, T will be the GEOMETRY? - Lottery

The lottery is 60000 elk in which 6200 wins. What is the probability that the purchase of 12 elks won nothing? - Angle between lines

Calculate the angle between these two lines: ? ? - Vector 7

Given vector OA(12,16) and vector OB(4,1). Find vector AB and vector |A|. - Geometric sequence 5

About members of geometric sequence we know: ? ? Calculate a_{1}(first member) and q (common ratio or q-coefficient) - Root

Use law of square roots roots: ? - Playing cards

How many possible ways are to shuffle 7 playing cards? - Exponential equation

Solve for x: (4^x):0,5=2/64. - Cards

The player gets 8 cards of 32. What is the probability that it gets a) all 4 aces b) at least 1 ace - Vans

In how many ways can 9 shuttle vans line up at the airport? - Cotangent

If the angle α is acute, and cotg α = 1/3. Determine the value of sin α, cos α, tg α. - MF graduate

78 school students graduate from mathematics or physics. There are three times more students who graduate from mathematics and do not graduate from physics than those who graduate from physics and do not graduate from mathematics. 69 students graduate fro

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