Write in standard notation 6.12 x 10 to the 3rd power

What is the simplified form of 7 √x • 7 √x • 7 √x • 7 √x?

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air