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Paraphin [41]
3 years ago
5

How do you know whether an equation is an identity?

Mathematics
1 answer:
olganol [36]3 years ago
7 0
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HELP ASAP Solve for x. Show or explain your work.
irinina [24]

Answer:

x=4.5

Step-by-step explanation:

From AAA, both triangles in this figure are similar. Therefore, we can set up the following proportion:

\frac{x}{9}=\frac{x+3}{15} or \frac{x}{9}=\frac{3}{6}.

Cross-multiplying, we get:

6x=9(3),\\6x=27,\\x=\frac{27}{6}=\fbox{$4.5$}.

7 0
2 years ago
How do you find the quadratic function with vertex (-2,5) and point (0,9)?
Anastaziya [24]

Answer: y = (x +2)² + 5

<u>Step-by-step explanation:</u>

y = a(x - h)² + k <em>where "a" is the leading coefficient and (h, k) is the vertex</em>

Since we don't know "a", we need to plug in the point (x, y) and the vertex (h, k) to solve for "a":  (x, y) = (0, 9) and (h, k) = (-2, 5)

y = a(x - h)² + k

9 = a(0 - (-2))² + 5

9 = a(0 + 2)² + 5

9 = a(2)² + 5

<u>-5 </u>   <u>          -5 </u>

4  =  a(4)

<u>÷4 </u>   <u> ÷4   </u>

 1 = a

Next, plug in "a" and the vertex (h, k):

y = a(x - h)² + k

y = 1(x +2)² + 5

y = (x +2)² + 5


6 0
3 years ago
James has 1/10 yard of blue felt and 5/6 yard of green felt.
Alina [70]

Answer:

3\4 yard

Step-by-step explanation:

5\6 - 1\10

= 11\15

= 0.73

and 3\4

= 0.75

SO..

3\4 yard is the most accurate

8 0
2 years ago
Need a little bit of help
klemol [59]

Answer:

b

Step-by-step explanation:

5 0
3 years ago
PLEASE HURRY!!!! TIMED!!!! WILL GIVE BRAINLIEST!!!!
sweet-ann [11.9K]

Answer:

\sqrt{28}

Step-by-step explanation:

You don't need to memorize all of the square roots.  Looking at each square root, find a number close to it that you know -- The square root of five is close to the square root of four, which is 2. The square root of 28 is close to the square root of 25, which is 5.  28 is a slightly bigger than 25, so the square root will be slightly greater than 5.

3 0
3 years ago
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