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Andreas93 [3]
3 years ago
14

Solve: 16x2 − 81 = 0.

Mathematics
2 answers:
masha68 [24]3 years ago
7 0

Answer:

If you would like to solve 16x^2 - 81 = 0, you can calculate this using the following steps:

16x^2 - 81 = 0

(4x - 9) * (4x + 9) = 0

1. 4x - 9 = 0 ... 4x = 9 ... x = 9/4

2. 4x + 9 = 0 ... 4x = - 9 ... x = - 9/4

The correct result would be: x = 9 over 4, x = −9 over 4. 

Yanka [14]3 years ago
6 0
If you would like to solve 16x^2 - 81 = 0, you can calculate this using the following steps:

<span>16x^2 - 81 = 0
</span>(4x - 9) * (4x + 9) = 0
1. 4x - 9 = 0 ... 4x = 9 ... x = 9/4
2. 4x + 9 = 0 ... 4x = - 9 ... x = - 9/4

The correct result would be: <span>x = 9 over 4, x = −9 over 4.</span> 
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PLEASE HELP ASAP. WILL GIVE BRAINLIEST.
earnstyle [38]

Answer:

After washing 20 cars together, each team will have raised the same amount in total.

Step-by-step explanation:

Let x represent the number of cars that each each teams will wash for them to raise the same amount in total.

The volleyball team gets $4 per car. In addition, they have already brought in $24 from past fundraisers. This means that the total amount raised by the volleyball team after washing x cars would be

4x + 24

The wrestling team has raised $84 in the past, and they are making $1 per car today. This means that the total amount raised by the wrestling team after washing x cars would be

x + 84

For both amounts to be equal, the number of cars would be

4x + 24 = x + 84

4x - x = 84 - 24

3x = 60

x = 60/3

x = 20

3 0
3 years ago
Find the length of the radius of a circle whose center is at the origin and passes through (3,4)
Harman [31]

well, by definition the distance from the center to a point on the circle is the radius. Well, we know the center is at 0,0 and a point is at 3,4, so

\bf ~~~~~~~~~~~~\textit{distance between 2 points} \\\\ (\stackrel{x_1}{0}~,~\stackrel{y_1}{0})\qquad  (\stackrel{x_2}{3}~,~\stackrel{y_2}{4})\qquad \qquad  d = \sqrt{( x_2- x_1)^2 + ( y_2- y_1)^2} \\\\\\ \stackrel{radius}{r}=\sqrt{(3-0)^2+(4-0)^2}\implies r=\sqrt{3^2+4^2} \\\\\\ r=\sqrt{9+16}\implies r=\sqrt{25}\implies r=5

3 0
3 years ago
Do students that are "Greek" (those who belong to a sorority/fraternity) have a tendency to be more involved in student governme
defon

Answer:

Step-by-step explanation:

Greek students will represent p1 (proportion 1)

Non-Greek students will represent p2

If we were to conduct a hypothesis test for this data, we would use a test for the difference of 2 proportions.  The hypothesis for this test would be as follows...

H0:  p1 - p2 = 0

Ha:  p1 - p2 > 0

The reason the alternate hypothesis is greater than 0 is because the question claims that the proportion of greek students (p1) is greater than the proportion of non-greek students (p2).  So p2 is smaller than p1.  We are subtracting a smaller number from a larger number.  That will always result in a positive number.

7 0
3 years ago
35% of 20kids are boys.How many boys are there?
lesya [120]
35% of 20 = 35/100 × 20 = 7 boys
pls mark brainliest
8 0
3 years ago
Read 2 more answers
Can somebody help solve either of these?
Leya [2.2K]
First one:
The circumference of the whole circle is (2π x the radius), 
and 60° is (60/360) = 1/6 of the whole circumference.

Second one:
The area of the whole circle is (π x the radius²), and
the 40° sector is (40/360) = 1/9 of the whole area.

I hope this is enough help.
8 0
3 years ago
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