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If a rectangle has sides (x+3) and (2x-1) and an area of 15, find x and the length of each side.

To find x, we need to create an expression from the information given. We know the area is 15 and that the area is equal to the length multiplied by the width. This gives us:(x+3)(2x-1) = 15Then we can expan...
JL
Answered by Jasmin L. • Maths tutor
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Work out: 3 ½ – 2 ⅓ Give your answer as a improper fraction

3 ½ = 7/22 ⅓ = 7/3To add or subtract 2 fractions, the denominator (bottom number) must be the same. To create a common denominator we can multiply the first fraction by 3 and the second by 2.This gives us 7/...
MS
Answered by Mai S. • Maths tutor
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Describe how the small intestine is adapted for the absorption of nutrients

The small intestine has several adaptations to facilitate the absorption of nutrients: a short diffusion distance (single layer of epithelium) to maximise absorption, a good blood supply to rapidly transport...
TC
Answered by Tashi C. • Biology tutor
5284 Views

Solve 5x^2 = 10x + 4 , to 2 decimal places.

First rearrange to get 5x 2 - 10x - 4 = 0 , by subtracting 10x and 4 from both sides of the equation. Here, we can use the quadratic formula which is x = -b+- sqrt(b 2 -4ac) / 2a. In our question a=5 , b=-10...
AP
Answered by Alexander P. • Maths tutor
15738 Views

Iron is found in the Earth as iron oxide (Fe2O3). Iron oxide is reduced to produce iron. Balance the equation for the reaction. ___Fe2O3 + ___C → ___Fe + ___ CO2

Balancing means that you have the same number of atom on one side as you do on the other. The reason for balancing is because atoms are not lost or created during a reaction. Keep in mind that when you balan...
TD
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