PLEASE HURRY!! ANSWER BOTH QUESTIONS: 1. Triangle LMN is similar to Triangle RST. If MN = 21 cm, RT = 9 cm, ST = 7 cm and RS = 6 cm, then what is the perimeter of Triangle LMN? (no pictures)

2. Robert wants to buy a new video game for $96. If the final price, including tax, is $104.64, then what is the percent of sales tax?

3.
At an altitude of 250 miles, the space shuttle travels at approximately 17,500 miles per hour in orbit around the Earth. Use dimensional analysis to determine how many feet per second the shuttle travels.