What is 2x=30 I don't know what this answer is30

Which expression represents the sum of 21 and an unknown number? A. 21-d B. 21+d C. 21:d D. 21d

Rahul solved the equation 2 (x - 1/8) - 3/5 x = 55/4. In which step did he use the addition property of equality?

Given the system of equations presented here: 4x + y = 4 2x + 7y = 28 Which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated?

4 {} = 3+8 balance the equation

The wingspan of a small plane is 7 meters. If there are approximately 3.28 feet in one meter, what is the wingspan of the plane in feet? Round your answer to the nearest hundredth.

Emily makes 250 grams of a snack mixture. 15% of the weight is raisins, 25% is banana chips and the rest is peanuts. How many grams of peanuts does she use?

Which is the better buy, $8.47 for 7 pounds of apples or $11.07 for 9 pounds? Explain

A person walks 1/4 mile in 1/8 hour. The person's speed is X miles per hour. Find X

Find the median of the following data set: 61, 58, 58, 56, 55, 55, 55, 54.

Kathy distributes jelly beans among her friends. Alia gets 4² fewer beans than kelly who gets 3³ jelly beans. how many jelly beans does alia get