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Expand and simplify (x-5)(3x+3)

Begin by expanding brackets using FOIL (first, outer, inner, last) method (demonstrated on whiteboard to make clear). Multiplying the first term of each bracket gives 3x 2 , multiplying outer terms gives 3x,...
CJ
Answered by Christopher J. • Maths tutor
5010 Views

Calculate the file size in bits for a two minute sound recording that has used a sample rate of 1000 Hertz (Hz) and a sample resolution of 5 bits.

First, calculate time in seconds: 2 minutes * 60 = 120 seconds File size (bits) = time (seconds) * sample rate (Hz) * sample resolution (bits) File size = 120 * 1000 * 5 bitsFile size = 600,000 bits
JG
Answered by James G. • Computing tutor
5252 Views

How to solve a simultaneous equation?

2x+3y=7 ----(1)x-y=1 -----(2)First, look at how you can eliminate one of the unknowns. Here we can multiply the second equation by 3 to make eliminate the "3y" in the first equation. We will then h...
HS
Answered by Ho Sum W. • Maths tutor
3448 Views

x : y = 7 : 4, x + y =88. Work out the value of x - y.

Here we use the ratios given to calculate the answer. First we sum add 7 and 4 to find total parts. 7 + 4 = 11. Then we divide 88 by 11. 88/11 = 8.This means we know that each part in the given ratio is 8.He...
AC
Answered by Alice C. • Maths tutor
5675 Views

How do I make an argument in an exam?

It's important to take a few minutes to quickly plan your argument in response to a particular question. You do not want to waste too much writing time doing this, but it is crucial to have a rough structure...
RM
7455 Views