Top answers

What are the four conditions for life on planet earth?

Availability of water; appropriate temperature range; suitable ambient gases; sunlight
AB
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How do I show that (cos^4x - sin^4x) / cos^2x = 1 - tan^2x

Start with the LHS: (cos^4x - sin^4x) / cos^2x Recognise the difference of two squares on the top line, which simplifies to (cos^2x - sin^2x)(cos^2x + sin^2x): (cos^2x - sin^2x)(cos^2x + sin^2x) / cos^2x Bec...
JM
Answered by Jack M. • Maths tutor
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In a computer program, a parameter may be passed to a procedure by value. Explain how this method works.

Parameters are variables sent to procedures so that the procedures are able to use them. There are two main ways of passing parameters, one of which is by value: Passing a parameter by value is where a copy ...
AQ
Answered by Aymen Q. • Computing tutor
3001 Views

£3000 is invested for 2 years at 3.8% per annum compound interest. What is the total interest earned over the 2 years?

We can use the following formula: Amount after n years' compound interest = Initial amount x (1 + r) n r = The interest rate in decimal form. n = Number of years. Simply plug the values into our formula: £30...
AT
Answered by Arisera T. • Maths tutor
10426 Views

Farmer Joe has a rectangular pen to hold his animals. The pen’s length is 5 meters longer than the width. The pen’s area is 84 meters. Find it’s width.

Step 1 define the variables: L stands for the length, W stands for the width Step 2 write what we know algebraically: Since the length is 5 meters longer than the width we have L = W + 5. Finally, the area i...
OB
Answered by Omar B. • Maths tutor
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