Find the sum of the first 19 terms of the arithmetic progression a1, a2, ..., an, ..., if a10 = 20.

What is this inequality notation? t is less then or equal to 2

Question 3(multiple choice worth 1 points) use the arc length formula and the given information to find r. s = 16 cm, θ = 48°; r = ? sixty divided by pi cm thirty divided by pi cm one third cm one hundred twenty divided by pi cm

An engineer scale model shows a building that is 3 inches tall. if the scale is 1 inch = 600 feet, how tall is the actual building?