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Work out the ratio between the surface area of sphere of radius 6cm and the total surface area of a hemisphere of radius 9cm.

Here you need to use two formulae; one for the surface area of a sphere (4πr²) and one for the area of a circle (πr²).

First the surface area of the 6cm radius spher...

Answered by Liam P. • Maths tutor

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Solve the quadratic equation: 5x2+8x+2

Here you need to use the quadratic formula, it cannot be solved by expanding out the brackets. In the formulae for which can be found on the formulae sheet. In this case a=5, b=8 and c=2.

Answered by Liam P. • Maths tutor

5082 Views

Solve 5x-6=3x+7

The key point to remember when dealing with an algebra equation is that whatever operation you carry out on one side of the equation, you MUST do to the other side as well.

To solve this ...

Answered by Kyle B. • Maths tutor

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Describe how different environmental factors affect the direction of root and shoot growth in plants. You should refer to the role of plant hormones.

You could refer to the following. Shoots grow upwards towards light (positive phototropism) and grow against the force of gravity (negative gravitropism). Roots grow with the direction of gravity (posi...

Answered by Liam P. • Biology tutor

25039 Views

What is the difference between the verbs "estar" and "ser"?

Both "estar" and "ser" mean "to be". However "estar" should be used when describing something temporary. For instance, when describing a location or explaining a...

Answered by Megan L. • Spanish tutor

5362 Views