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alukav5142 [94]
3 years ago
10

What is the value of the expression 9x^2-12x+4 when x=3

Mathematics
1 answer:
Inessa05 [86]3 years ago
4 0

Answer:

49

Step-by-step explanation:

When x=3,

= 9x^2-12x+4

= 9(3)^2-12(3)+4

=81-36+4

=49

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49 points, will give Brainliest! Having a lot of trouble with Determining the domains of functions. Khan Academy Algebra I.
prohojiy [21]

Domains of functions are the values that <em>can</em> be plugged into the function and not "break" it. By "break" I mean that the denominator cannot be 0, in this case. If the denominator is 0, we will get a divide by 0 error, and thus, we must restrict the domain. All values of x will work except 9/4:

\frac{7-3x}{4x-9}

Let's plug in 9/4 and see what happens:

\frac{7-3(\frac{9}{4})}{4(\frac{9}{4})-9}   = \frac{whatever}{0}

So, plugging in 9/4 results in denominator equalling 0. Therefore, we must restrict the domain so that x ≠ 9/4. Your answer is All real values of x such that x ≠ 9/4.

6 0
4 years ago
Read 2 more answers
A sprinkler system is designed to water 5/8 acre of land in 1/4 hour. How many acres of land can it water in 1 hour?
IRISSAK [1]
5/8 acre of land ... 1/4 hour
x acres of land = ? ... 1 hour

If you would like to know how many acres of land can the sprinkler system water in 1 hour, you can calculate this using the following steps:

5/8 * 1 = 1/4 * x
5/8 = 1/4 * x       /*4
x = 5/8 * 4
x = 5/2 = 2.5 = 2 1/2 acres of land

The correct result would be 2 1/2 acres of land.
5 0
3 years ago
In △ABC, m∠A=27 °, c=14 , and m∠B=25 °. Find a to the nearest tenth.
Gnesinka [82]

Answer:

a = 8.1

Step-by-step explanation:

Firstly, since we have a triangle, automatically, we have 3 interior angles

Mathematically the sum of these angles = 180

A + B + C = 180

27 + 25 + C = 180

52 + C = 180

C = 180-52

C = 128

We use the sine rule to find a

The sine rule posits that the ratio of a side to the sine of the angle facing that side is equal for all the sides of a triangle

Thus, mathematically according to the sine rule;

c/Sin C = a/Sin A

14/sin 128 = a/sin 27

a = 14sin27/sin 128 = 8.0657

which to the nearest tenth is 8.1

3 0
4 years ago
 in the question above which all applies
Mandarinka [93]
The first answer and last answer.
7 0
3 years ago
A firm receives an order for a square-base rectangular storage container with a lid. The container has a volume of 20 cubic mete
Svetlanka [38]

Answer:

400 im pretty sure

Step-by-step explanation:

8 0
4 years ago
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