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yulyashka [42]
4 years ago
10

Find the area of trapezoid

Mathematics
1 answer:
Y_Kistochka [10]4 years ago
4 0
Area = 1/2 h (b1 + b2)

If we draw another line inside the trapezoid half way between the top and bottom lines. This line will cut the sides on the left and right exactly in half.

And that is exactly what is happening in this picture. The side to the right is perfectly divided in half and the side to the left is also divided in half by that dashed line. That means that the second upper half of trapezoid is also 3, which makes the height to be 6. 

Now that you know the height, you can find out the area.
(17+7)/2*6 = 72 cm^2
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What is the inverse of the function y = -8x + 15?
MrRa [10]

y = -8x + 15\\ 8x=-y+15\\ x=-\dfrac{y-15}{8}\\\\ y^{-1}=-\dfrac{x-15}{8}

6 0
3 years ago
If you are good at sequences in math please help I am giving more points
vodka [1.7K]

Answer:

C. 101 - 5(n - 1)

Step-by-step explanation:

d = (26 - 71)/(16 - 7)

d = -45/9

d = -5

a7 = a1 + (7-1)(-5)

71 = a1 - 30

a1 = 101

an = 101 + (n - 1)(-5)

an = 101 - 5(n - 1)

4 0
3 years ago
Read 2 more answers
Which of the following is NOT true about the tails in a​ distribution?
Alla [95]

Answer:

The answer is D: The inequality symbol in the alternative hypothesis points away from the critical region.

Step-by-step explanation:

We usually have a one-tailed and two-tailed tests. Examples of a one-tailed test are the left-tailed and the right tailed test. These tests are referred to as one-tailed tests because the critical region or rejection region is located in only one tail. The critical region of a left or right tailed test is that region that correlate with the rejection region and is usually located in extreme left or right tail. Furthermore, tails in a distribution are usually the extreme critical regions also known as the rejection regions which are bound by critical values. However there is nothing that suggests the statement in Option D when talking about tails in a distribution.

6 0
4 years ago
If you started counting when you first learned how to count and then counted by ones, eight hours a day, 5 days a week for 50 we
xenn [34]

Answer:

The number they would count is \approx 0.49\cdot10^{-2}\ \%}

Step-by-step explanation:

One mole is equal to 6.02214076x10^23 particles. In order to know the number counted by every human on Earth we simply multiply the number of humans times the count a "good counter" can achieve, 4x10^9x7.44x10^9 (for USA, change to 4x10^12 if you use de British English definition). Thus:

\displaystyle{\frac{4\cdot10^9\cdot7.44\cdot10^9}{6.02214076\cdot10^{23}}=\frac{2.976\cdot 10^{19}}{6.02214076\cdot10^{23}}\approx 0.49 \cdot 10^{-4}\approx 0.49\cdot10^{-2}\ \%}

6 0
3 years ago
A jar has 4 red marbles 7 blue marbles and 8 yellow marbles what is the probability of randomly selecting a marble and getting a
fiasKO [112]
<h3>Answer:  7/19</h3>

Explanation:

There are 7 blue marbles out of 4+7+8 = 11+8 = 19 total

The probability of selecting blue is therefore 7/19

We cannot reduce 7/19 any further because 7 and 19 have no common factors other than 1.

4 0
3 years ago
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