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3 years ago

Evaluate 2x2 - 1 when x = 3.

Mathematics

2 answers:

myrzilka [38]3 years ago

7 0

When x is evaluated to 3 you get 11.

2(3)2-1 = 11

tigry1 [53]3 years ago

6 0

X should equal 11
2(3)2-1
6(2)-1
12-1
11

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1/x + 1/4 = 7/12 solve for x

Licemer1 [7]

Given equation is
$\frac{1}{x} + \frac{1}{4} = \frac{7}{12}$

We can solve it by subtracting 1/4 both side
$\frac{1}{x} + \frac{1}{4} - \frac{1}{4} = \frac{7}{12} - \frac{1}{4}$

$\frac{1}{x} = \frac{7}{12} - \frac{1}{4}$
                          $= \frac{7 - 3}{12}$
                          $= \frac{4}{12}$
                          $= \frac{1}{3}$

So $\frac{1}{x} = \frac{1}{3}$
On comparing x = 3.

SO the solution of equation is x = 3

5 0

4 years ago

If 317 + x = 609 then,

diamong [38]

Answer:

Step-by-step explanation:

subtract 317 from 609.

7 0

3 years ago

Evaluate the expression when q=5 and b=9.<br> a+4b

Ierofanga [76]

Step-by-step explanation:

a = 5

b= 9

a + 4b = ?

5 + 4×9 =

5 + 36 = 41

The order of operations is a rule that tells the correct sequence of steps for evaluating a math expression. We can remember the order using PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

8 0

3 years ago

For a regular 30 sided polygon , what is the degree of rotation

Mashcka [7]

The measure of any interior angle of a convex regular n-gon is :
180 º - ( 360 º / n )

For a 30-sided polygon,
interior angle = 180 º - ( 360 º / 30 )
..................... = 180 º - 12 º
..................... = 168 º

6 0

3 years ago

Explain the steps on how u got the answer <br> ••••••••••••••••••

dem82 [27]

Answer:

volume of cyclinder=πr²h

=3.14×2²×3=37.68cm³

rectangular prism volume=6×5×7

=210cm³

total volume=37.68+210=247.68cm³

6 0

3 years ago

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