A forest covers 78,000 acres. A survey finds that 0.4% of the forest is old-growth trees. How many acres of old-growth trees are there?
There are
acres of old-growth trees.

The deck that kenneth is building is in the shape of a parallelogram abcd the measure of angle c is one third the measure of angle b find the measure of each angle of the deck

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.