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4 years ago

Need help with 7 and 8 please

Mathematics

2 answers:

iren2701 [21]4 years ago

3 0

7 is “what was our opinion of the experiment and results?”

8 is “random”

pishuonlain [190]4 years ago

3 0

Number 7 is an opinion of your experiment and your results that you got that’s it and 8 is random I think I hope this helps you

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NemiM [27]

Answer:

Step-by-step explanation:

$\frac{1}{2} = \frac{7}{14} \\$

$\frac{1}{7} = \frac{2}{14}$

$\frac{7}{14} + \frac{2}{14} = \frac{9}{14}$

5+2=7

$7 + \frac{9}{14} = 7 \frac{9}{14}$

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3 years ago

Use the fraction bar interactive tool to find the lowest common denominator before subtracting 2 3 from 5 6 . What is the lowest

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Answer:

Step-by-step explanation:

5/6 - 4/6 = 1/6

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4 years ago

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Which has the greatest value: 1/20, 1/80, or 1/100?

JulijaS [17]

Answer:1/20

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4 years ago

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4 years ago

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At a point on the ground 80 ft from the base of a tree, the distance to the top of the tree is 11 ft more than 2 times the heigh

Sergio039 [100]

Let h be the height of the tree and d the distance to the top of the tree from the point on the ground. Draw a diagram to visualize the situation:

Since the distance to the top of the tree is 11 ft more than two times the height, then:

$d=2h+11$

Use the Pythagorean Theorem to relate the length of the sides of the right triangle:

$\begin{gathered} h^2+80^2=d^2 \\ \Rightarrow h^2+6400=(2h+11)^2 \\ \operatorname{\Rightarrow}h^2+6400=(2h)^2+2(11)(2h)+11^2 \\ \operatorname{\Rightarrow}h^2+6400=4h^2+44h+121 \end{gathered}$

Notice that we have obtained a quadratic equation in terms of h. Write it in standard form and use the quadratic formula to solve for h:

$\begin{gathered} \Rightarrow0=4h^2+44h+121-h^2-6400 \\ \Rightarrow0=4h^2-h^2+44h+121-6400 \\ \Rightarrow0=3h^2+44h-6279 \\ \Rightarrow3h^2+44h-6279=0 \\ \\ \Rightarrow h=\frac{-44\pm\sqrt{(44)^2-4(3)(-6279)}}{2(3)} \\ \\ \therefore h_1=39 \\ h_2=-53.666.. \end{gathered}$

Since the height of the tree must be positive, the only solution is h=39ft. To the nearest foot, the height of the tree is 39.

Therefore, the height of the tree is 39 ft.

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1 year ago