Top answers

2 chocolates weight 250g, there are 220 calories in 100g of chocolate. How many calories are in one chocolate?

275 Calories
IL
Answered by Ieuan L. • Maths tutor
4765 Views

Solve these simultaneous equations: 3x-5=-4y and 2xy=-4

First start with 2xy=-4, rearrange to find in terms of x, x=-2/y. Substitute this into the other equation (3x-5=-4y), producing -6/y -5 =-4y.Times every term by -y resulting in 6+5y=4y 2 .Rearrange to 4y 2 -...
AS
Answered by Amelia S. • Maths tutor
3675 Views

When working with probabilities why is it sometimes necessary to add and sometimes to multiply?

Whether you need to add or multiply depends on whether it is a case of 'AND' or 'OR'. For 'AND' you multiply, and for 'OR' you add. Below are examples of each case, using dice as an example: To calculate the...
MW
Answered by Marcus W. • Maths tutor
3386 Views

Solve the simultaneous equations: y=x^2 + 3x + 7 and y=x + 10

x= -3 and 1y= 7 and 11
US
Answered by Usmaan S. • Maths tutor
3763 Views

How do you make f the subject of the following a = c/d + e/f

1)Multiply out the right hand side to give a common denominator: a= (Cf+de)/df2) Cross multiply to get rid of the denominator fda = cf + de3) bring all terms containing f to the same side and factorise fda -...
KD
Answered by Kwaku D. • Maths tutor
3539 Views