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Elena-2011 [213]
3 years ago
5

Solve the quadratic equation below: 4x^2 -100=0

Mathematics
2 answers:
anzhelika [568]3 years ago
6 0

Answer:

solution given:

4x^2 -100=0

4x²=10²

(2x)²=10²so

2x=±10

x=±10/2

so

x=5

or x=-5

GrogVix [38]3 years ago
3 0

Answer:

The answer is x=-5

Step-by-step explanation:

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Solve the equation logo(13 - 1) = 1.<br> Answer?
rosijanka [135]

Answer:

Equation is not a solution

Step-by-step explanation:

Because 12 does not equal 1.

8 0
4 years ago
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Rom4ik [11]

Answer:

49

Step-by-step explanation:

100- 51 = 49

7 0
4 years ago
Suppose a set of test scores is appproximately bell-shaped, with a mean of 68 and a range of 54. (a) The minimum test score is a
liberstina [14]

Answer:

a.) Minimum test score = 41

    Maximum test score = 95

b.)An approximate value of the standard deviation is 9.

Step-by-step explanation:

The given set of test scores is approximately bell shaped.

The mean of the test scores, \mu = 68

The range of the data set = 54.

a.) i.) Minimum test score  = \mu - \frac{range}{2}  = 68 - \frac{54}{2}  = 68 - 27 = 41

   ii.) The maximum test score = \mu + \frac{range}{2}  = 68 + \frac{54}{2}  = 68 + 27 = 95

b.) From the 68-95-99.7 rule, also known as the Empirical rule, tell us that an approximation of the range is 3 standard deviations either way from the mean. So from this rule we can say that the minimum can also be found from \mu - 3\sigma and the maximum can also be approximated as \mu + 3\sigma.

From the above we can say that the range can be written as

   3\sigma - (-3\sigma) = range

∴   6\sigma  = range

∴    \sigma  = \frac{range }{6}  = \frac{54}{6}  = 9

Therefore an approximate value of the standard deviation is 9.

7 0
3 years ago
Let f(x) = x-9<br> Find (f o f)(x) and its domain<br> (f o f)(x) =
Oksi-84 [34.3K]

Answer:

Step-by-step explanation:

6 0
3 years ago
Find x and y, given that line KL and line MN are parallel. Please show how you got your answer.
Olegator [25]
Answers: 
x = 19/2 = 9.5
y = 44/3 = 14.667
The decimal value of y is approximate

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

The triangles are similar. So the corresponding sides form a proportion

KM/KJ = LN/LJ
(x-2)/5 = 12/8
8(x-2) = 5*12
8x-16 = 60
8x = 60+16
8x = 76
x = 76/8
x = 19/2
x = 9.5

Similarly,
MN/KL = LN/LJ
22/y = 12/8
22*8 = 12y
12y = 176
y = 176/12
y = 44/3
y = 14.667 (value is approximate)

8 0
3 years ago
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