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lapo4ka [179]
3 years ago
13

Help question is attached

Mathematics
1 answer:
olga2289 [7]3 years ago
3 0

Answer:

28 cm^2

Step-by-step explanation:

8*7=56

56/2=28

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Simplify the trigonomic expression 1/1+ sin
Softa [21]

Answer:

\sec^2\theta-\tan\theta\sec\theta

Step-by-step explanation:

We have to simplify the trigonometric expression \frac{1}{1+\sin\theta}

Let us multiply the numerator and denominator by 1-\sin\theta

\frac{1}{1+\sin\theta}\times\frac{1-\sin\theta}{1-\sin\theta}

In the denominator apply the formula for difference of squares

a^2-b^2=(a+b)(a-b)

Thus, the denominator will become

(1+\sin\theta)(1-\sin\theta)=1-\sin^2\theta

Thus, the expression is

\frac{1-\sin\theta}{1-\sin^2\theta}

Using the relation 1-\sin^2\theta=\cos^2\theta

\frac{1-\sin\theta}{\cos^2\theta}

We can rewrite this expression as

\frac{1}{\cos^2\theta}-\frac{\sin\theta}{\cos^2\theta}

Finally, the simplified expression is

\sec^2\theta-\tan\theta\sec\theta

6 0
3 years ago
Read 2 more answers
What is the value of (-7+3i)+(2-6i)? A)-9+9i B)-5+9i C) -9-3i D) -5-3i
Delicious77 [7]

Answer:

D

Step-by-step explanation:

Add real numbers and add imaginary numbers

(-7 + 3i)+(2 - 6i) = -7 + 2 + 3i - 6i

                        =  - 5 - 3i

4 0
3 years ago
Read 2 more answers
A bacteria culture begins with eight bacteria which triple in size every week. how many bacteria exist in the culture after four
bija089 [108]
Well, you would have to multiply 8 by whatever factorial of 3, in this case 4 for the number of weeks
The equation is 8 x 3^4 which equals 648

My only thing is that they only triple in SIZE, and not multiply (as in make more of themselves) so technically speaking, there would still be 8 bacteria, just much bigger
3 0
4 years ago
Find the equation of the line whose slope is -3 and which passes through the point (-5, 3)
nadezda [96]

Answer:

y=-3x-12

Step-by-step explanation:

Plug into equation y=mx+b

3=(-3)-5+b

Simplify

3=15+b

Subtract 15 from both sides

-12=b

Add slope and y-intercept into base equation

y=-3x-12

4 0
4 years ago
how many feet are in 3.2km given that 1 mile is 1.609km and 1 mile 5280.A. 2654.85ft B. 8495.52ft C. 9437.42ft D. 10500.93ft
LuckyWell [14K]

Answer:

3.2 km * 1 / 1.609 mi / km * 5280 ft / mi = 10,501 ft

Check:    3280.84 ft / km * 3.2 km = 10,499 ft

5 0
3 years ago
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