The tree in the illustration casts a shadow 
feet long, while a person 
feet tall casts a shadow
src="https://sciemce.com/media/3/ppg__cognero__Section_9.5_Congruent_Triangles_and_Simliar_Triangles__media__59f51353-1537-4557-8241-db794e3402dd.PNG" class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_1a2b1fc7c7b54852a471e1b13" /> feet long.
?
Find the height of the tree.
?
?
A. 
B. 15
C. 
D. 9
E. none of these
Answer: D
Mathematics
src="https://sciemce.com/media/3/ppg__cognero__Section_9.5_Congruent_Triangles_and_Simliar_Triangles__media__59f51353-1537-4557-8241-db794e3402dd.PNG" class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_1a2b1fc7c7b54852a471e1b13" /> feet long.
?
Find the height of the tree.
?
?
A.
B. 15
C.
D. 9
E. none of these
Answer: D
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Divide and, if possible, simplify.
A. x
B. 3x
C. 3x
D. 3x
Write the sentence as an equation. Let the variable x represent the number.The product of 6 and a number, increased by 3, is 21.
A. 6x - 3 = 21 B. 6x + 3 = 21 C. 18x = 21 D. 6(x + 3) = 21
Determine if the graph of the function is concave up or concave down.y = 4(x + 1)2 + 2
A. Concave down B. Concave up
Simplify. Write the answer with positive exponents only. 
2
A. x6y8
B. x10y12
C. 
D. 