The angle of elevation from tammy to the helicopter is 12 degrees. tammy and rusty are 700 meters apart. if tammy is 400 meters from the helicopter, how much distance is there between the rusty and the helicopter? .
a. 146 meters.
b. 320 meters.
c. 574 meters.
d. 806 meters

We will use the Cosine Law:
x² = 700² + 400² - 2 · 700 · 400 · cos 12°
x² = 490,000 + 160,000 - 560,000· 0.9781476
x² = 490,000 + 160,000 - 547,762.35
x² = 102,237.35
x =√102,237.35 = 319.75 ≈ 320 m
B ) 320 meters.

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.