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nikdorinn [45]
3 years ago
9

There are 99 cats and 121 dogs participating in a costume competition. What percent of the participants are cats?

Mathematics
1 answer:
kakasveta [241]3 years ago
8 0
About 81.82 rounded.
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Given the equation Square root of 8x plus 1 = 5, solve for x and identify if it is an extraneous solution.
Kisachek [45]
Do recall that squaring and the *radical sign* cancel each other out... like so:(\sqrt{a})^{2}= a

When you put it that way, it isn't enough :P
(\sqrt{a})^{2}= a
(\sqrt{8x+1})^{2}=?

so you start with
(\sqrt{8x+1})^{2}= (5)^{2}
8x+1=25 <-- subtract 1 to both sides
8x=24 <- divide 8 to both sides
x= 3

To find out if it's an extraneous solution ask yourself: It mustn't result in a radical that I like to call... 'illegal'. Plug it into the radicand 8x+1 and make sure you get something that is not a negative number.... so, DO you get a negative number when you plug in x = 3 into the radicand?

(extraneous solution is a invalid solution)

x=3 not extraneous


6 0
3 years ago
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Doug's teacher told him that the standardized score (z-score) for his mathematics
BigorU [14]

Answer:

Doug’s test score is 1.20 standard deviations above the average test score of the students in the course.

I just took the test and got it right :)

Step-by-step explanation:

8 0
2 years ago
What is -15+v over -3=21
Snezhnost [94]

Answer:

V = -48

Step-by-step explanation:

((-15 + v) /  -3) = 21

(-15 + v) = -63

v = -63 + 15

v = -48

4 0
3 years ago
What is the lateral area of the drawing?
katrin2010 [14]

The lateral area of the shape is the sum of the area of all lateral faces.

The area of the lateral face that is rectangle with sides 5 mi and 2 mi is

A=5\cdot 2=10\ mi^2.

As you can see the shape has all four lateral faces of the same rectangular form with the same sides lengths, therefore,

LA=4A=4\cdot 10=40\ mi^2.

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8 0
3 years ago
What is the formula of the area of any triangle
MrRissso [65]

Answer:Side x side x side

Step-by-step explanation:

Since it is usually equally sided, it would be SxSxS

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3 years ago
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