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A conical vase of base radius 5cm and height 20cm is filled with 200ml of water, how high is the water level? Give your answer to 3 significant figures.

Answer: 2.96 cm Equations used: Volume of a cone = (base area x height) / 3 ; Base Area = pi x radius 2 Volume of whole vase = (pi x 5 2 x 20)/3 = 523.6 cm 3 (4sf) therefore Volume of air in vase with 200ml ...
IC
Answered by Ian C. • Maths tutor
4064 Views

Factorise the following equation: 2x^2 + 8x + 8

The first step in factorising is to look for a 'common factor'. A common factor is a number or letter that all the values have in common. All the integers (numbers) in this equation can be divided by 2. Ther...
EK
Answered by Ellen K. • Maths tutor
6838 Views

How do I find the roots of a quadratic equation?

There are a few methods you can use. Here are two methods: 1) Inspection. Say we have the equation x 2 +4x+3. We can find two numbers which multiply together to make 3 but add together to make 4. Such number...
DE
Answered by Daniel E. • Maths tutor
4400 Views

A circular table top has diameter 140 cm. Calculate the area of the table top in cm² , giving your answer as a multiple of π.

Area of a circle = π r² r = (1/2) d = (1/2) * 140 = 70 area = π * (70)² = 4900 π cm²
SM
Answered by Sulem M. • Maths tutor
3765 Views

Expand and simplify 2y+3y(5y+3)

Following the laws of BIDMAS, the bracket needs to be multiplied first (instead of adding 2y and 3y first): 2y + 15y 2 + 9y Simplify by addition of the y's: 15y 2 + 11y Optional: simplify further by grouping...
LJ
Answered by Lucy J. • Maths tutor
5293 Views