Pls answer this question!! (will give brainliest)

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar