2 years ago

1/2(-4+6n)=1/3n+2/3(n+9)

Mathematics

2 answers:

elena55 [62]2 years ago

7 0

Answer:

n= 4

Step-by-step explanation:

azamat2 years ago

3 0

The correct answer is n=4:)

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Show that the equation x cubed + 8x = 30 has a solution between x = 2.2 and x =2.3 ?

tatuchka [14]

$x^3+8x=30\\
x^3+8x-30=0\\\\
2.2^3+8\cdot2.2-30=10.648+17.6-30=-1.752\\
2.3^3+8\cdot2.3-30=12.167+18.4-30=0.567
$

For $x=2.2$ the value of $x^3+8x-30$ is negative, and for $x=2.3$ the value is positive which means between $x=2.2$ and $x=2.3$ there is an x for which the value of $x^3+8x-30$ is equal to 0 and therefore there is a solution.

4 0

3 years ago

Name the plane shape that has infinite numbers of lines of symmetry

Ne4ueva [31]

A circle has an infinite number of lines of symmetry.

8 0

3 years ago

I need help asap thanks

kifflom [539]

Answer:

B. y=5/4 x-4

Step-by-step explanation:

Slope of line= $\frac{y2-y1}{x2-x1}$

= $\frac{1-(-4)}{4-0}$

=5/4

3 0

3 years ago

Consider a political discussion group consisting of 1010 Democrats, 1010 Republicans, and 55 Independents. Suppose that two gr

yan [13]

Answer:

The probability is $\frac{3}{20}$

Step-by-step explanation:

Consider a political discussion group consisting of 10 Democrats, 10 Republicans, and 5 Independents.

Total members of the group = $10+10+5=25$

Selecting 2 republicans in succession means selecting 1st republican out of 10 republicans and total 25 members and then selecting 2nd republican out of 9 left republicans and 24 members.

Hence, probability becomes:

$\frac{10}{25}\times \frac{9}{24}$