exam Maths Puzzle Numerical Ability

The length of a rectangle 3 cm greater than its width. If the area of the rectangle is 40 cm squared, find the lengh and width..

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write the equation of the line with slope 5 and y-intercept (0,-3)

thanks for the help I need to find the rational exponent equation L = 2.43*W^0.3326 to estimate the wingspan L in feet fo the bird. Weighs W pounds I need to include the wingspan of a peacock 6Ft. and weight of 13 pounds. How would I work this problem correctly?