Which of the following is found in large quantities in the earth’s crust?
silicon
nickel
iron
magnesium

Silicon is found in large quantities in the earth's crust.

Explanation:  Because Earth's crust basically contains eight elements where Silicon is one of the quantities of earth's crust. (Silicon) makes up 27.7% of the elements in the earth’s crust

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank