If element X has 12 protons, how many electrons does it have?

Mary had 25 marbles in a bag. The bag contains 10 red marbles, 7 blue marbles, and 8 green marbles. Mary pulled out two marbles one at a time without replacement. What is the probability Mary selected a green marbles and then a red marble?

What is the value of x in the proportion 2x+7/3x-4=11/12 A - 2 B-58 C-11/29 D-2/5

What is x if the equation is 3x=2x+50

Write the equations parallel to y=-4; (-3,2)

3) Which equation represents a proportional relationship? A) y = 3x 8 B) y = 3 8x C) y = 3x 8 + 1 D) y = 3 8x + 1

Angie baked 100 cookies and 20 brownies. she wants to split them into equal groups for the bake sale. each group must have the same number of cookoes and brownies with none left over. What is the greatest number of groups she can make?

In a lab a substance was cooled by 42C over a 7 hours at a constant rate. What was the change in temperature each hour?

Convert 7 meters per minute to yards per hour. round tin the nearest tenth.

A circle is defined as having 360°. How could that information become useful when you start to inscribe triangles in circles?

Which statements about opposites are true? Select each correct answer. A. The opposite of zero is zero. B. The opposite of a negative number is always a positive number. C.