3.8 times 10-8 to standard notation

Noah and Andre are 15 miles apart on a bike path when they start biking towards each other. Noah rides at a constant speed of 4 miles per hour, and Andre rides at a constant speed of 2 miles per hour. How long does it take until Noah and Andre meet?

Triangles QVS and RTS are similar. Find side VS.

Which set of rational numbers are ordered from least to greatest? A number line going from negative 3 to positive 3 in increments of 1.

If you earn one penny every 10 seconds of your life, how many dollars would you have after 65 years?

Keiko has a total of $ 5200 comma which she has invested in two accounts. The larger account is $ 900 greater than the smaller account. (Let x be the amount of money in the larger account and y be the amount of money in the smaller account.)

it snowed 1/8 inch every hour for 3 hours. Then it snowed 1/2 inch every hour for 7 hours. what was the total snow fall that was measured overall 10 hours?

If circle a has a diameter of 3 cm what is the circumference in cm?

Simplify - 2 (2h+10) + 4h

There are 300 students in the eighth grade. The ratio of girls to boys is 3 to 2. What percent of the students are boys?

Jake is building a fence around his property. He wants the perimeter to be no more than 100 feet. He also wants the length to be at least 30 feet longer than the width.