Math practice for 13 year olds - page 430 of 436
Number of problems found: 8718
- Diofant 2
Is equation 1140x +876y = 48 solvable on the set of integers Z? - Diofant equation In the set of integers (Z), solve the equation: 212x +316y =0 Write result with integer parameter t in Z (parameter t = ...-2,-1,0,1,2,3... if equation has infinitely many solutions)
- Reciprocal
Prove that if a > b > 0, then: (1)/(a)< (1)/(b) - Euler problem
Someone buys a number of towels for a total of 720 tolars. If for the same amount of money they could buy 6 more towels, each towel would be 6 tolars cheaper. How many towels were originally bought? - Binomials
Add a number to the binomial 100x²-260x so that the resulting trinomial is the square of a binomial. - Powers
Is it true for any number a,b,c,d equality:? (a-b-c-d) 6 = (d+c+b-a) 6 - Is equal
Is it equal following terms? -9 21 = (-9) 21 - Rectangular field
One dimension of a rectangular field is 168 m greater than the other. When each side is increased by 9 m, the area of the field becomes 2187 m². Find the dimensions of the field. - Determine the number
Determine the number x that x+8 is (7)/(5) from one half of 7 x -1. - Root
Use the law of square roots: cbrt (sqrt[2] (sqrt[4] (6))) = sqrt[n] (6) - Rates
When gas consumption, the consumer may choose one of two rates: rate A - which pays 0.4 € per 1 m³ of gas a flat monthly fee of 4.2 € (regardless of consumption) rate B - which pays 0.351 € per 1 m³ of gas a flat monthly fee of 10.1 € From what monthly co - Center traverse
Does the midsegment of a triangle bisect its area? - Diagonals of the rhombus
Calculate the height of a rhombus whose diagonals are 18 cm and 6 cm. - 3-bracket 3
Two angles of a triangle are 90° and 45°. Does the triangle have at least two equal sides? - Number
Is number 2.8814789 irrational? - Ratio
Increase the number 25.6 in the ratio 7:4. - Chord
In a circle with radius r = 60 cm, there is a chord that is 4 times longer than its distance from the centre. What is the length of the chord? - Box
Calculate the angle between the base of a cuboid with dimensions 5 × 10 and its space diagonal of length 13. - Rotating cone II
Calculate the lateral surface area of a cone with base radius r = 20 cm and height h = 10 cm. - Is right?
Is a triangle with sides 15, 66, and 68 a right triangle?
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