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nikdorinn [45]
3 years ago
9

What are the 2 things we look for when trying to decide if two figures are scaled copies?

Mathematics
1 answer:
Vadim26 [7]3 years ago
5 0

if the angles are the same, and side lengths are equally decreased or increased (depending if you are scaling up or down)

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(Sinθ-cosθ)(sinθ+cosθ)=1-2cos^2θ
ohaa [14]

Answer:

See below

Step-by-step explanation:

( \sin \theta -  \cos \theta)( \sin \theta  +  \cos \theta) = 1 - 2 { \cos}^{2}  \theta \\  \\ LHS   = ( \sin \theta -  \cos \theta)( \sin \theta  +  \cos \theta)  \\  \\  =  \sin^{2}  \theta -  \cos^{2}  \theta \\  \\  =1 -  \cos^{2}  \theta -  \cos^{2}  \theta \\( \because  \sin^{2}  \theta =1 -  \cos^{2}  \theta)  \\  \\  = 1 - 2 { \cos}^{2}  \theta   \\ = RHS

Thus proved

8 0
3 years ago
The area for the square below is 49 inches. What is the measurement of
shutvik [7]

Answer:

7

Step-by-step explanation:

Area for a square is s² where 's' is a side (all sides have the same length)

6 0
3 years ago
I need help solving this, and one other question, please!
Softa [21]
The answer is D for this q
5 0
4 years ago
Read 2 more answers
A fair die is cast four times. Calculate
solmaris [256]

Step-by-step explanation:

<h2>You can solve this using the binomial probability formula.</h2><h2>The fact that "obtaining at least two 6s" requires you to include cases where you would get three and four 6s as well.</h2><h2>Then, we can set the equation as follows:</h2><h2> </h2><h2>P(X≥x) = ∑(k=x to n) C(n k) p^k q^(n-k) </h2><h2>n=4, x=2, k=2</h2><h2>when x=2 (4 2)(1/6)^2(5/6)^4-2 = 0.1157</h2><h2>when x=3 (4 3)(1/6)^3(5/6)^4-3 = 0.0154</h2><h2>when x=4 (4 4)(1/6)^4(5/6)^4-4 = 0.0008</h2><h2>Add them up, and you should get 0.1319 or 13.2% (rounded to the nearest tenth)</h2>
6 0
3 years ago
After a car left the A station for 4 kilometers, it advanced for an hour at an average speed of 40 km/h. Find a functional relat
True [87]

The function would be f(x) = 40x + 4.

It's plus 4 because it starts counting after the 4 kilometers already happened.

It's 40x because that's the rate of change (km/h) and the x represents the hours.

f(x) basically means y, but in functions you use f(x).

Hope this helps :)

8 0
3 years ago
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