What's - 3a (5a-7) ?

I can't figure It out.

Explain why the absolute value of a number is always positive: essay question

You score an 86 on the first of two exams. Write and solve an equation to find the score x that you need on the second exam to have a mean score of 90.

What is the value of the expression? 3⋅[ (30-8) : 2+2]3·[ (30-8) : 2+2] Enter your answer in the box.

What number is 80% of 65

Round to the nearest 10. 41 A. 42 B. 40 C. 50 D. 30

If you were on the moon, your weight would only be 0.17 of your weight on Earth. If you weigh 195.75 pounds on Earth, how much would you weigh on the moon?

Find the center, vertices, and foci of the ellipse with equation x^2/100+y^2/64 = 1.

The first person has $15 and saves $1.50 each day. The second person has $55 and spends $4.50 each day. In about how many days will they have the same amount of money? a 7 days b 15 days c 21 days d 12 days

Ten students participated in a raffle to win a computer. There are two new computers being given away and two students will be chosen at random one at a time without replacement. How many possible ways are there to choose the two students?

A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i. e., of the population) is 0.22 ounces. In this problem the 0.22 is Select one: a. a parameter. b.