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Given that a = 3 and b = 7 , What is the value of 2a + b ?

This is a case of substitution. 2(3)+(7) =13

Answered by Shayna B. • Maths tutor

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The diagram shows a sector ORST of a circle with centre O. OR = OT = 10.4 cm. Angle ROT = 120°. (a) Calculate the length of the arc RST of the sector (3s.f)

Before using a more complex formula it is better to know how to answer the question using a simpler method.

From the diagram we can see that this is a sector from a circle. We need to find out the ...

Answered by Maddie C. • Maths tutor

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The price of a pencil grows by 1%. What is the final crice if the initial price was £1?

1*1/100+1= 1.001

Answered by A Rin J. • Maths tutor

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What is the gradient of the graph y = 3x^2 + 5x + 2, when x is 4?

To find the gradient of the graph, we need to differentiate the equation. So if y = xⁿ ==> the derivative dy/dx = nx^n-1 This means that dy/dx = 6x + 5 for this eq...

Answered by Rishabh H. • Maths tutor

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What is the difference between the median and the mean values for this set of data: 11, 9, 21, 6, 18, 2, 17, 8, 7.

Median: Reorder the data in numerical order, then select the value that lies directly in the middle of the data line - if there is an odd number of data, the median value is the middle number and if there...

Answered by James M. • Maths tutor

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