B because a turning point of the graph means the valley or the top of a period of graph, the slope of the tangent line of which turn from negative to positive or from positive to negative.
Answer: -6+13=7
Step-by-step explanation:
1.
√(16+20)=√36=6
C
2.
√(21-9)=√(12)=(√4)(√3)=2√3
B
3. 2*√3=2*1.73205=3.464
B
1.C
2.B
3.B
