The altitude a (in feet) of a plane t minutes after liftoff is given by a=3400t+600. How many minutes after liftoff is the plane at an altitude of 21,000 feet?

True or false? In a two-column proof, the left column contains a series of deductions. A. True B. False

Is 39/49 in simplest form

The product of two numbers is 5 greater than their sum. One number is x, and the other number is 3. Which of the following equations could be used to me X? A. 3x = (x + 3) - 5 B. 3x = x+3 / 5 C. 3x = (1 - 3) - 5 D. 3x = (x + 3) + 5 E.

Which expression can be used to find the area of a circle with a diameter of 30 cm?

Which question is a statistical question? How many theaters are there in my city? How many students in my class like classic movies? How many movies do the students in my class watch in a month? How many students in my class watch movies on weekdays?

The kindergarten teacher wants to divide 1/2 of her classroom into 5 equal sections for stations

A train traveling at 30 miles per hour reaches a tunnel which is 9 times as long as the train. If the train takes 2 minutes to completely clear the tunnel, how long is the train in miles? (1 mile = 5,280 feet)

The cost for 7 dance lessons is $82. the cost for 11 is $122. write a linear equations to find the total cost C for L dance lessons. How much for 4 lessons?

What is 9.09 repeating as a fraction?

The number of gallons of water in a tank that already has 300 gallons in it after being filled at 35 gallons per minute for m minutes