a. an element
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Which of the following can be formed by physically combining pure substances?
a. an element
c. a compound
b. a mixture
d. all of the above
Answers: 2
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After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?
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Simplify. 4+3/7x-2-2/7x a. 2-5/7x b. 6-1/7x c. 2+1/7x d. 6+5/7x
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Which of the following can be formed by physically combining pure substances?
a. an element
a. an element
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