When estimating a population mean, are you more likely to be correct when using a point estimate or an interval estimate?

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?