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A piece of wire is 240cm long. Peter cuts two 45 cm lengths off the wire. He then cuts the rest of the wire into as many 40cm length as possible. How many wires of 40cm can be cut?

Two 45cm lengths cut off 240cm long wire. 240 - (2*45) = 150cmHow many 40cm length wires can be cut out of the remainder 150cm wire?150/40= 3.75As we are looking for entire 40cm length wires, we disregard th...
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Answered by Federico B. • Maths tutor
8301 Views

How many real solutions does x²=-36 have?

There are no real answers for this equation.This is because you would have to square root a negative number to solve the equation and that is a mathmatic impossibility.
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Answered by Harry C. • Maths tutor
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Solve the following algebraic equation: x^2 + 6x + 9 = 0

I would explain on the whiteboard how to factorise itleading them to having two brackets, (x + 3) and (x+3). Could also be written as (x+3)^2then teach them on whiteboard how to solve the equation(x+3)^2 = 0...
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Answered by Isabella J. • Maths tutor
2402 Views

Differentiate sin(2x)

2cos(2x)
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Answered by matthew h. • Maths tutor
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simplify the following equation: 3a x 4ab

Thinking about each term individually, we can rewrite the equation as:3 x a x 4 x a x b = then we can multiply the numbers: 3 x 4 = 12then multiply the letters: a x a = a2 (a squared) x bnow join everything ...
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Answered by Adam D. • Maths tutor
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