What is 100000000000 in a decimal all me point i will give

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read