a triangle PQR in 3-space has vertices P(7,1,2), Q(2,2,5), R(3,-1,3). Use vectors to decide which one of the following properties the triangle has. 1. not right-angled at P, Q, or R 2. right-angled at R 3. right-angled at P 4. right-angled at Q

sec -pi / 12

a man shines a laser beam from a third story window

A baseball diamond is square with sides of 90 feet. What is the shortest distance, to the nearest tenth of a foot, between first base and third base?

percent change from 110 to 154

find the percent change from 110 to 154

1. Summation x^n / 4n , n , 1, infinity image: http://www.webassign.net/cgi-bin/symimage.cgi?expr=sum_%28n%3D1%29^infinity%20x**n%2F%284**n%29 (a) Find the values of x for which the series converges. (Enter the smaller number first.) (_____,_____) (b) Find the sum of the series for...

A heavy rope, 80 ft long weighs 0.6 lb/ft and hangs over the edge of a building 150 ft high. How much work in ft-lbs is done in pulling the rope up to the top of the building?

Your School sold 456 for a high school play. adult tickets were $3.50 students were $1.00 total ticket sales were $1131, give a system equations that relates too the adult/ student tickets sold to the total number of tickets sold

x^3+3x^2+25x+75=0; find all imaginary and real solutions