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Solve the simultaneous equations: 2x - y = 4 and x + 2y = 7

Solve: 2x - y = 4 and x + 2y = 7 There are two methods to solve this, you can either calculate one of the variables from either equations and then substitute to the second one or try to multiply one of the e...
EK
Answered by Eliza K. • Maths tutor
16614 Views

Work out the value of 2a^2 + b^3 when a = 5 and b = –3

It is best to approach this question in parts, then combine the parts to find your solution. This question may be split into parts, as follows: Firstly, if a = 5, then a 2 = 5 2 = 5 x 5 = 25. So a 2 = 25 Sec...
TD
Answered by Tutor51449 D. • Maths tutor
14845 Views

5 students are in a maths class and 10 students are in a physics class. The mean mark of the maths class is 90 and the mean mark of the physics class is 85. Work out the mean mark of both classes.

To find the mean mark the formula is mean = ∑marks /number of students Therefore the mean for maths is 90 and so ∑marks = mean number of students = 90 5 = 450 and the ∑marks for the physics class is 85*10= 8...
RS
Answered by Ryan S. • Maths tutor
3841 Views

Hairdresser A charges £66 for a haircut and has an offer of 1/3rd off. Hairdresser B charges £70 for a haircut and has an offer of 20% off. Which hairdresser is cheaper?

Hairdresser A as they charge £44 wheras Hairdresser B charges £56
EN
Answered by Ellen N. • Maths tutor
3276 Views

Work out an estimate for the value of (8.1 x 198)/0.0491

So, the question has asked to "estimate" not calculate an exact answer. Therefore, the first step is to round the values into ones that are easier to work with: 8.1 -> 8 ; 198 -> 200 ; 0.0491...
NH
Answered by Naomi H. • Maths tutor
7429 Views