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Yanka [14]
3 years ago
9

7th grade math pls help

Mathematics
2 answers:
Elis [28]3 years ago
5 0
It would be A because 53+127=180
Archy [21]3 years ago
4 0

Answer:

A- measure of angle 1 is 53 degrees

Step-by-step explanation:

Just trust me.

You might be interested in
Which point lies on the graph of the function shown below?
horsena [70]

Answer:

(1, 1)

Step-by-step explanation:

We need to evaluate the given expression for each of the x-values and check if the y-value agrees with the y-value given in the pairs:

1) First point (-1,3): use x=-1 and check if y results in "3":

y=-x^2+4x-2\\y=-(-1)^2+4(-1)-2\\y=-1-4-2=-7

we obtained y=-7, so the point (-1,3) is Not on the graph of the function

2) Second point (0,2): use x=0 and check if y results in "2":

y=-x^2+4x-2\\y=-(0)^2+4(0)-2\\y=-0+0-2=-2

we obtained y=-2, so the point (0,2) is Not on the graph of the function

3) Third point (2,-2): use x=2 and check if y results in "-2":

y=-x^2+4x-2\\y=-(2)^2+4(2)-2\\y=-4+8-2=2

we obtained y=2 (and not -2), so the point (2,-2) is Not on the graph of the function

4) Fourth point (1,1): use x=1 and check if y results in "1":

y=-x^2+4x-2\\y=-(1)^2+4(1)-2\\y=-1+4-2=1

we obtained y=1 (the same y as in the given coordinate pair), so the point (1,1) IS on the graph of the function

4 0
3 years ago
You use technology ans find a sum of 6.712E-8. Write this sum in standard form
belka [17]

Answer:

0.000\,000\,067\,12

Step-by-step explanation:

The exponent of -8 tells you the most significant digit (6) goes in the 8th position to the right of the decimal point.

With some spaces to help in counting decimal places, the number is written ...

0.000\,000\,067\,12

8 0
3 years ago
According to a flight statistics​ website, in​ 2009, a certain airline had the highest percentage of​ on-time flights in the air
sp2606 [1]

Answer:

a) 0.0139; b) 0.1809; c) 0.4278

Step-by-step explanation:

We use a normal approximation to a binomial distribution for these problems.

The sample size, n, for each is 30; p, the probability of success, is 0.808.  This makes the mean, μ = np = 30(0.808) = 24.24.  The standard deviation,

σ = √(npq) = √(30(0.808)(1-0.808)) = √(30(0.808)(0.192)) = √4.65408 = 2.1573

For part a,

We are asked for P(X < 20).  Using continuity correction to account for the discrete variable, we find

P(X < 19.5)

z = (19.5-24.24)/(2.1573) = -4.74/2.1573 = -2.20

Using a z table, we see that the area under the curve to the left of this is 0.0139.

For part b,

We are asked for P(X = 24).  Using continuity correction, we find

P(23.5 < X < 24.5)

z = (23.5-24.24)/2.1573 = -0.74/2.1573 = -0.34

z = (24.5-24.24)/2.1573 = 0.26/2.1573 = 0.12

Using a z table, we see that the area under the curve to the left of z = -0.34 is 0.3669.  The area under the curve to the left of z = 0.12 is 0.5478.  The area between them is then

0.5478-0.3669 = 0.1809.

For part c,

We are asked to find P(25 ≤ X ≤ 28).  Using continuity correction, we find

P(24.5 < X < 28.5)

z = (24.5-24.24)/2.1573 = 0.26/2.1573 = 0.12

z = (28.5-24.24)/2.1573 = 4.26/2.1573 = 1.97

Using a z table, we see that the area under the curve to the left of z = 0.12 is 0.5478.  The area under the curve to the left of z = 1.97 is 0.9756.  The area between them is 0.9756 - 0.5478 = 0.4278.

4 0
4 years ago
Please Help. I really don’t get this concept, if you could explain it in detail it would be very appreciated
Dafna11 [192]
<h3>Answer: 24/25</h3>

=================================================

Explanation:

Sine is given to be negative, and so is tangent. This only happens in quadrant Q4

Recall that y = sin(theta), so if sin(theta) < 0, then we're below the x axis.

If tan(theta) < 0, then this means cos(theta) > 0

So we have y < 0 and x > 0 which places the angle somewhere in Q4.

--------------------------

Draw a right triangle as shown below in the attached image. We have AC = 25 and BC = 7. Use the pythagorean theorem to find that AB = 24

So this is what your steps may look like

a^2+b^2 = c^2

7^2+b^2 = 25^2

b^2+49 = 625

b^2 = 625-49

b^2 = 576

b = sqrt(576)

b = 24

So because AB = 24, we know that the cosine of the angle is adjacent/hypotenuse = 24/25

---------------------------

As an alternative, you could use the trig identity

sin^2(x) + cos^2(x) = 1

and plug in the given value of sine to solve for cosine. The cosine value result will be positive since we're in Q4.

So,

sin^2(x) + cos^2(x) = 1

(-7/25)^2 + cos^2(x) = 1

(49/625) + cos^2(x) = 1

cos^2(x) = 1 - (49/625)

cos^2(x) = (625/625) - (49/625)

cos^2(x) = (625-49)/625

cos^2(x) = 576/625

cos(x) = sqrt(576/625)

cos(x) = sqrt(576)/sqrt(625)

cos(x) = 24/25

This is effectively a rephrasing of the previous section since the pythagorean trig identity is more or less the pythagorean theorem (just in a trig form)

6 0
4 years ago
So for this problem what I did was I divided 210 (the total number of calories) / 10 (calories from the fat). The total came out
Tcecarenko [31]

For percentages, we divide the part by the whole. In this case, the part is the number of calories from fat and the whole is the total number of calories.

10 / 210 = 0.0476 = 4.76%

Then, we need to round to the nearest tenth.

The answer is 4.8%

Hope this helps!

6 0
3 years ago
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