I would really appreciate some help with this.

If data collected shows that 95% of cars travel at a speed less than 140 km h^-1, and 10% travel less than 90 km h^-1. What is the average and the SD for the cars? And what is the proportion of cars that travel at speeds exceeding 110 km^-1?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

(a) compute the maclaurin polynomial m2(x) for f(x) = cos x. (b) use the polynomial of part (a) to estimate cos π 12. (c) use a calculator to compute the error made using the estimate from part (b) for the value of cos π 12. remember that the error is defined to be the absolute value of the difference between the true value and the estimate.

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).