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Kay [80]
3 years ago
9

Math please help now fast

Mathematics
1 answer:
sukhopar [10]3 years ago
6 0
1. Rational
2. No Rational
3. Rational
4. Rational
5. Rational
6. No Rational
7. Rational
8. 


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PLZ HELP
Alex

Answer:

The correct option is C ) 109.5°

Therefore,

m\angle E=109.5\°

Step-by-step explanation:

Given:

In Triangle DEF

d = 10

e = 18

f = 12

To Find

angle E = ?

Solution:

In Triangle DEF , Cosine Rule says

\cos E=\dfrac{f^{2}+d^{2}-e^{2}}{2fd}

Substituting the values we get

\cos E=\dfrac{12^{2}+10^{2}-18^{2}}{2\times 12\times 10}

\cos E=\dfrac{-80}{240}=-\dfrac{1}{3}

Therefore,

\angle E=\cos^{-1}(-0.3333)

m\angle E=109.5\°       ............As it is in Second Quadrant

Therefore,

m\angle E=109.5\°

4 0
3 years ago
Find the area of the circle
gladu [14]

Answer:

its 452.2

Step-by-step explanation:

because im right

5 0
3 years ago
Read 2 more answers
Find the value of a²+b <br> if...<br> a=-2 and b=5
Nana76 [90]

Answer:

9

Step-by-step explanation:

a²+b

Substituting values,

=> (-2)^2+5

=> 4 + 5

=> 9

4 0
3 years ago
Read 2 more answers
Using the given information write the equation of parabolas:
lana [24]

The general form of the equation we need to find is (x - h)^2 = 4p(y- k).

The center is the distance between the directrix and focus.

So, center (h, k) = (3, 3/2) .

P = distance from center to the focus and it just so happens to be 1.5.

We now plug everything into the formula given above.

(x - 3)^2 = 4(1.5)(y - 3/2)

(x - 3)^2 = 6(y - 3/2)

Done!

8 0
3 years ago
What is a value of y that satisfies the inequality below? y3≤12
STALIN [3.7K]

Answer:

4

Step-by-step explanation:

because 4 Times 3 equals 12 so less than or equal to hope this helps

8 0
3 years ago
Read 2 more answers
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