Which equation has the solutions x = 1 plus-or-minus StartRoot 5 EndRoot?

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Yahir designs bracelets. he uses between 9 and 15 red and yellow beads in the ratio of 2 red bead to 5 yellow beads. drag the beads into the container to meet these requirements

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)