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Evaluate 3 /5 + 1/ 4

5×4=20 common denominator what did you do to 5 to get to 20? X4, therefore you have to 3x4=12what did you do to 4 to get to 20? X5, therefore you have to 1x5=5
12/20 + 5/20= 17/20

Answered by Vickie K. • Maths tutor

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Harry drives from Exeter to London in 4 hours at an average speed of 70km/h. Ron drives from Exeter to London in 5 hours. (a) Assuming Ron took the same route as Harry, calculate Ron's average speed.

The distance from Exeter to London can be calculated using the information about Harry's journey. Average speed = Distance/Time so Distance = Average speed x Time. This means that the distance from Exeter...

Answered by James F. • Maths tutor

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Write down the value of 169^1/2 (one hundred and sixty nine to the power of a half)

Answer = 13
"to the power of 1/2" is the same as saying "square root"

Answered by Rasila C. • Maths tutor

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Using a method that is not factorisation, solve the equation (x^2) + 3x -4 = 0. Hence, sketch the curve produced by the equation

One method that could be used to solve the equation is using the quadratic formula given by:x = ( -b ± (b² - 4ac)^0.5) / 2a where ax² + bx + c = 0Substituting our values in...

Answered by Joseph W. • Maths tutor

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Complete the square of the equation below.

Q. Complete the square : x²+ 4x - 12A. Completing the square is putting the given equation into the form (x + a) ² + bFirst, a = the coefficient of x 2so in this case a = ...

Answered by Victoria Y. • Maths tutor

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