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MAXImum [283]
3 years ago
7

In a survey music preferences

Mathematics
2 answers:
Over [174]3 years ago
7 0
81/450 is 0.18.
If you move the decimal place to the right two spots, you've got your percentage.
18% said they preferred country music.
Salsk061 [2.6K]3 years ago
7 0
We can write all information we have as:

81 answers = x% of 450 students

So we just need to do a simple equation:

81 = x% * 450
81 = \frac{x}{100} * 450
81 = \frac{x}{10} * 45
81 = \frac{45x}{10}                 / * 10 (both sides)
810 = 45x                    / ÷ 45 (both sides)
<u>x = 18 [percent]</u>

Answer: 18% of the students preferred country music.
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A car's position is given by s(t) = {3 – 5t? + 7t hundreds of meters with t in minutes.
Nadya [2.5K]

Answer:

A) (1 s, 2.3 s)

B) (-4 m/s², 3.8 m/s²)

Step-by-step explanation:

The car's position which is the distance is given by the equation;

s(t) = t³ - 5t² + 7t

A) Velocity is the first derivative of the distance. Thus;

v(t) = ds/dt = 3t² - 10t + 7

At v = 0, we have;

3t² - 10t + 7 = 0

Using quadratic formula, we have;

t = 1 and t = 2.3

Thus, time at velocity of 0 is t = (1 s, 2.3 s)

B) acceleration is the derivative of the velocity. Thus;

a(t) = dV/dt = 6t - 10

At velocity of 0, we got t = 1 and t = 2.3

Thus;

a(1) = 6(1) - 10 = -4 m/s²

a(2.3) = 6(2.3) - 10 = 3.8 m/s

Thus, a(t) at v = 0 gives; (-4 m/s², 3.8 m/s²)

8 0
2 years ago
Whats the answer to 4/5 × 1/2
laiz [17]
2/5 is the equivalent

6 0
3 years ago
4. You and a friend go to the movies and split the cost of the movie tickets and snacks. You pay the bill. You tell your friend
tigry1 [53]
The answer is B/2-4=9; b =$26
3 0
3 years ago
Read 2 more answers
A reactangular court measures 600 cm wide and 700 cm long find the perimeter?
Tcecarenko [31]

Answer:

2(l+b)

2(600cm+700cm)

2(1300cm)

2600cm

Therefore, the perimeter of the rectangular court is 2600cm.

4 0
2 years ago
Help help help help help pleases pelass thank you
Elodia [21]

Answer:

a' (-6,7) b' (-5,3) c'(-2,4)

Step-by-step explanation:

5 0
2 years ago
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