Determine the number solutions for system x-2y=1 and -4x+8y=-4

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?