exam Maths Puzzle Numerical Ability

Write and solve an equation to find the value of x.

4.8 , 1.6 , 5.2, x ; mean 3.7

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exam Other Question

A plane travels 1800 miles against a headwind in 4 hours. The return trip, now with a tailwind, takes an hour less. What is the rate of speed of the wind? How do I graph the ellipse, specify the length of the major axes, minor axes, the center and the vertices of this equation: {{{3x^2+4y^2-18x+32y+79=0}}}