Math practice for 13 year olds - page 359 of 362
Number of problems found: 7234
- Electronics: Resistors in parallel
Concerning calculating the resistance of the parallel combination of resistors: (1)/(R) = (1)/(R1) + (1)/(R2) Calculate the R, if R1 = 17Ω a R2 = 20Ω - Barrel with liquid
Barrel with grain weight 297 kg. When it sheds 48% of grain, ha weight 174 kg, what is the weight of an empty barrel? - Triangle angles
The angles α, β, γ in triangle ABC are in the ratio 6:2:6. Calculate the size of angles. - Tractors
Fields go plow two tractors with various performances. The first tractor plows the whole field in 20 hours. The second tractor plows the whole field 4 hours kratšie. How long does it take to plow the whole field with two tractors?
- Bits, bytes
Calculate how many different numbers can be encoded in a 16-bit binary word. - Degrees to radians
Convert magnitude of the angle α = 33°25'45" to radians: - Tournament
Determine how many ways can be chosen two representatives from 34 students to school tournament. - Guests
How many ways can 8 guests sit down on 10 seats standing in a row? - Window
Peter demolished a box hole in the wall for the window frame 147×51 cm. When they come, they will find a master-fitted frame and window that glass is 13.3 cm from the hole in each direction. Calculate how much percent less light enters the window th
- Circumference - a simple
What is the ratio of the circumference of any circle and its diameter? Write the result as a real number rounded to 2 decimal places. - Tangents
To circle with a radius of 41 cm from the point R guided two tangents. The distance of both points of contact is 16 cm. Calculate the distance from point R and circle center. - Discounts on rail (ZSSK)
The railway company ZSSK offers a discount of 15% (REGIONAL) for 5 Eur/year. Calculate the real discount rate as a percentage, where passengers will travel 19 Eur per week. - Solidarity
Imagine a word solidarity means that salt donation to the needy, who have neither the salt. If we take the word solidarity, it is a word based on salt + gift (only in the Slovakian language). Calculate how many kilos of salt a sympathetic citizen "gives" - Sphere A2V
The surface of the sphere is 241 mm². What is its volume?
- Sphere fall
How much percent fall volume of a sphere if the diameter decreases 3×? - Sphere growth How many times does a volume of the sphere rise if priemer rises 10×?
- Density - simple example
Material of density of 1189 kg/m³ occupies a container volume of 64 cm³. What is its mass? - Floating barrel
The barrel (cylinder shape) floats on water, the top of the barrel is 8 dm above water, and the width of the surfaced barrel part is 23 dm. The barrel length is 24 dm. Calculate the volume of the barrel. - Circle arc
The circle segment has a circumference of 135.26 dm and 2096.58 dm² area. Calculate the radius of the circle and the size of the central angle.
The price of the cookie rise in the first year by 2%, the second year fell by 6%, and in the third year increased by 17%. Calculate the average annual increase in the price of the cookie.Do you have homework that you need help solving? Ask a question, and we will try to solve it. Solving math problems.
