Natalie is entering a bicycle race for charity. Her mother pledges $1.50 for every .5 miles. If Natalie bikes 30 miles, how much will her mother donate?

90$

Step-by-step explanation:

.5 is 1/2 mile

30x2

60x1.50

90

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."

8: 40

2 hours

10: 40

55 min

11: 35