13. Evaluate: 7x + 4y when x=5 and y=-3

Two fire-lookout stations are 190 miles apart, with station a directly south of station b. both stations spot a fire. the bearing of the fire from station a is upper n 55 degrees upper e and the bearing of the fire from station b is upper s 60 degrees e. how far, to the nearest tenth of a mile, is the fire from each lookout station?

The trigonometric ratios sine and secant are reciprocals of each other

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?