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Q) The equation of a curve is y=(x+4)^2+7. Find the co-ordinates of the turning point

Full Explanation:We have our Equation: y=(x+4)²+7
At the turning points, the gradient, (m) is zero m=0 = dy = 0To work out the g...

Answered by Jake C. • Maths tutor

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There are 14 boys in a class and 16 girls. The Mean height of the class is 1.6m, the mean of the girls is 1.5m what is the mean height of the boys?

Mean for all students: (the sum of all the heights)/total number of students = (the sum of boys+sum of girls)/30 = 1.6sum of boys and girls = 1.6 x 30Mean for girls: (the sum of all the girls' heights)/to...

Answered by Caitlin J. • Maths tutor

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Solve the two simulatneous equations x^2+y^2=18 and x-y=3

1) X2 +2Y2= 18 2) X - Y = 3 Rearrange 2) in the form X=3-Y then substitute in to 1); (3-y)2 +2Y2=18, this is your new equation 3 9+3Y+3Y+Y2+2Y2=18 3) 9+6y+3Y2= 18 Divide equation 3) by 3 3 ...

Answered by Rebecca C. • Maths tutor

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Amanda and Wim share some money in the ratio 2:5. Wim receives £115. Calculate how much money was shared?

First, you need to find value of one part. We can see that Wim who has a share of 5 parts gets £115. So, 5 parts is equivalent to £115. Therefore, value of each part is 115/5 = £23. Now,...

Answered by Saeideh N. • Maths tutor

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