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Elenna [48]
3 years ago
14

If C = 2a^2 - 5 and D = 3 - a , then C - 2D will equal ? Please answer ASAP!

Mathematics
1 answer:
Ivenika [448]3 years ago
3 0

Answer:

2a^2+−11

Step-by-step explanation:

Combine Like Terms:

=2a^2+−5+ −6

=(2a^2)+(−5+ −6)

=2a^2+−11

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We test for a hypothesized difference between two population means: H0: μ1 = μ2. The population standard deviations are unknown
Lina20 [59]

Answer:

The degrees of freedom associated with the critical value is 25.

Step-by-step explanation:

The number of values in the final calculation of a statistic that are free to vary is referred to as the degrees of freedom. That is, it is the number of independent ways by which a dynamic system can move, without disrupting any constraint imposed on it.

The degrees of freedom for the t-distribution is obtained by substituting the values of n1​ and n2​ in the degrees of freedom formula.

Degrees of freedom, df = n1​+n2​−2

                                       = 15+12−2=27−2=25​

Therefore, the degrees of freedom associated with the critical value is 25.

4 0
3 years ago
HIGHSCHOOL ALGEBRA!!!!! PLS HELP :) <br> Find the root of the equation: (6x–1)(6x+1) - 4x(9x+2) = −1
My name is Ann [436]

(6x–1)(6x+1) - 4x(9x+2) = −1

Simplify the left side:

36x^2-1 -36x^2-8x = -1

Combine like terms:

-1 -8x = -1

Add 1 to both sides:

-8x = 0

Divide both sides by -8:

x = 0 / -8

x = 0

The root is 0

5 0
4 years ago
Find the surface area. Round your answer to the nearest hundredth
Readme [11.4K]

Answer:  569.91\ ft^2

Step-by-step explanation:

From the given picture, the radius of the base of the cylinder = 5.5 ft.

The height of the cylinder = 5 ft.+6 ft.=11 ft.

We know that the surface area of a cylinder is given by :-

\text{Surface Area}=2\pi r (r+h)\\\\\Rightarrow\text{Surface Area}=2(3.14)(5.5)(5.5+11)\\\\\Rightarrow\text{Surface Area}=569.91\ ft^2

Hence, the surface area of the given cylinder = 569.91\ ft^2

6 0
4 years ago
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Lostsunrise [7]
Im lost at this sorry, hope sum1 helps you out on this tho!
7 0
3 years ago
Someone help me do the first problem so that I can do the rest
Novay_Z [31]

Answer:

C = 69.1 ft

Step-by-step explanation:

The circumference is given by

C = 2*pi*r

C = 2* 3.14 * 11

C =69.08

Round to the nearest tenth

C = 69.1 ft

7 0
4 years ago
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