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3 years ago

PERIODIC FUNCTIONS AND TRIGONOMETRY FOR 25 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1 answer:

7 0

The sine increases from 0 to 90 degrees and from 270 to 360 degrees
The sine decreases from 90 to 270 degrees

The cosine increases from 180 to 360 degrees
The cosine decreases from 0 to 180 degrees

Sine = 0 at 0 and 180 degrees

Cosine = 0 at 90 and 270 degrees

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Solving 8 problems per minute, Fast Finn can finish his test in time. He was however, working faster, solving 10 problems per mi

mrs_skeptik [129]

Answer:

Number of problems = 240

Step-by-step explanation:

Let x be the number of questions and t be the time.

Given:

Average rate = 8 problems per minute

Fast Finn rate = 10 problems per minute

Fast Finn taken time = t - 6

We need to find the number of problems on the test paper.

Solution:

Average rate to solve test paper.

$Average\ rate =\frac{Number\ of\ questions}{time}$

$8 =\frac{x}{t}$

$t =\frac{x}{8}$ --------------(1)

Fast Finn rate to solve the test paper.

$Average\ rate =\frac{Number\ of\ questions}{time}$

$10 =\frac{x}{t-6}$

Using cross multiplication rule.

$x=10(t-6)$

$x=10t-60$

substitute $t =\frac{x}{8}$ from equation 1.

$x=10(\frac{x}{8}) -60$

Rearrange the equation as:

$x - \frac{5}{4}x = -60$

$\frac{4x-5x}{4}=-60$

$-\frac{x}{4} = -60$

Using cross multiplication rule.

$x = 60\times 4$

x = 240 problems.

Therefore, 240 problems were on the test.

4 0

3 years ago

In the general population in the US, identical twins occur at a rate of 30 per 1,000 live births. A survey records 10,000 births

SSSSS [86.1K]

Answer:

Step-by-step explanation:

Given that in the general population in the US, identical twins occur at a rate of 30 per 1,000 live births. A survey records 10,000 births during Jan 2018 to Jan 2019 and found 400 twins in total.

From the above we find that population proportion is 0.03 and observed sample proportion is 0.04

So option a) is wrong

b) Correct

c) correct

d) Wrong

e) wrong

f) wrong

g) incomplete sentence

h) wrong

4 0

3 years ago

(Brainliest for fastest right answer!!) Which is correct?

Arisa [49]

Answer:

Step-by-step explanation:

a² - b² = (a - b)(a + b)

n² - 25 = n² - 5² = <em>(n - 5)(n + 5)</em>

7 0

3 years ago

Please help me now I’m a beginner and I so need help please explain how did you get you answer so I understand thanks

Irina-Kira [14]

Answer:y=2.5(x)

Step-by-step explanation:y=2.5(x)

y=2.5(2)= y=5

7 0

3 years ago

The median for the given set of six ordered values is 28.5

Alika [10]

X=the missing value

the median is the middle number, but in this case there are two which happens to be 25 and x
so the formula is

25+x/2=31.5
use algebra to solve
25+x=63
x=63-25
x= 38

Therefore, the missing value is 38.

Hope this helped. Let me know if you have any further questions:)

6 0

3 years ago