How many neutrons does element X have if its atomic number is 57 and its mass number is 168?

The dimensions of a rectangle are given in terms of x as shown below. x-1/2 2x + 4 Molly finds the perimeter to be 2 (2x + 4) + 2 (x-1/2). Noah finds the perimeter to be 2 (2x + 4+x - 1/2). Clara finds the perimeter to be 4x+8+2x-1/2.

3/7 x 2 (answer in simplest form)

In a survey of 1200 teenagers, 48% said they are involved in an extracurricular activity. What is the margin of error for the survey

Use the cubic model y=3x^3 to find the value of y when x=8

James Clerk Maxwell took the first durable photograph in 1734. True False

What divided by what equals 14

On Saturday, Mrs. Armour bought 7 pairs of socks for $3 each, and a sweater for her dog for $12. Then she found a $5 bill on the sidewalk. Over the coarse of Saturday, what was the change in the amount of money Mrs. Armour had?

The length of a rectangle is 4 Less Than 3 times the width. What is the area of the rectangle?

Triangle RST is congruent to triangle R" S" T". Which sequence of transformations could have been used to transform triangle RST to produce triangle R" S" T"? Which of these are the two correct answers? A.

Simplify. A. B. 125 C. 48 D. 415