Please help me with any of these questions

Mathematics

1 answer:

Anuta_ua [19.1K]3 years ago

3 0

Answer:

10.-8/-2 can't represent calculating a mean change in score because a mean change in score is counted by adding up the scores & then dividing it by the number of the scores. As a number of scores can never be negative, so -8 can't be divided by -2 . So, -8/-2 can't represent this.

6. a) Andrea's mean weekly change will be negative. Because after adding up her weekly changes, we'll find a negative number. & as the number of weeks is positive, then the mean will be a negative number .

b)the division equation is: -15/5

So, her mean weekly change is -3

Step-by-step explanation:

I know it's late, but I hope it helps

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Allushta [10]

Answer:

$\dfrac{ah}{a+h}$

Step-by-step explanation:

Consider similar triangles BMC and KMN.

In these triangles,

$\dfrac{BC}{KN}=\dfrac{MO}{MP},$

where O is the point of intersection of BC and MP.

Note that segment OP has the length the same as the side of the square ABCD. Hence,

$\dfrac{BC}{a}=\dfrac{h-BC}{h},\\ \\BC\cdot h=a(h-BC),\\ \\BCh=ah-aBC,\\ \\BC(h+a)=ah,\\ \\BC=\dfrac{ah}{a+h}.$

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3 years ago

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Naya [18.7K]

It is 270 i believe hope it helps

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3 years ago

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lyudmila [28]

M-4=84.

The equation is correct because the maple tree is 4 feet shorter than the elm tree. M represent the maple tree, so you take away four to find the elm.

The height of the maple tree is 88 feet.

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3 years ago

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rodikova [14]

Answer:

$5\sqrt{7}$

Step-by-step explanation:

$\frac{30\sqrt{14} }{6\sqrt{2} }$

Cancel out 6 in both numerator and denominator.

$\frac{5\sqrt{14} }{\sqrt{2} }$ Rationalize the denominator of $\frac{5\sqrt{14} }{\sqrt{2} }$ by multiplying the numerator and denominator by $\sqrt{2}$ .