Arectangle has a perimeter of 30 cm. what would be the new perimeter if the length and width of the rectangle i'd doubled in size?

Answer pls man im trying to get out of summer school

Caleb and emily are standing 100 yards from each other. caleb looks up at a 45° angle to see a hot air balloon. emily looks up at a 60° angle to see the same hot air balloon. approximately how far is the hot air balloon off the ground? a)44.2 yd. b)63.4 yd. c)73.2 yd. d)89.7 yd.

David pays a 20% income tax on his $2,100 salary. how many dollars is the tax? show work