A trapezoid is a 4-sided polygon which has 2 parallel sides.
Write an expression that represents the
perimeter of a trapezoid whose sides have
length a, b, c and d.

Use this expression to find the perimeter of
the trapezoid when a= 12. b
16. c = 16.
and d = 20.

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Which lists the organs in the correct order as food passes from the mouth to anus?

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present