After 2 years the simple interest paid on an investment of $2500 was $175. what percent was the interest rate

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

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)