2 years ago

Which expression could not be used to evaluate 25 · 18

Mathematics

1 answer:

Oxana [17]2 years ago

6 0

What are the options?

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Help I need the answer

Black_prince [1.1K]

Answer:

Step-by-step explanation: i will help u what is your question?

3 0

3 years ago

Verify the identity. cot(x - pi/2) = -tan(x)

gizmo_the_mogwai [7]

Answer:

See below.

Step-by-step explanation:

$\cot(x-\frac{\pi}{2})=-\tan(x)$

Convert the cotangent to cosine over sine:

$\frac{\cos(x-\frac{\pi}{2} )}{\sin(x-\frac{\pi}{2})} =-\tan(x)$

Use the cofunction identities. The cofunction identities are:

$\sin(x)=\cos(\frac{\pi}{2}-x)\\\cos(x)=\sin(\frac{\pi}{2}-x)$

To convert this, factor out a negative one from the cosine and sine.

$\frac{\cos(-(\frac{\pi}{2}-x ))}{\sin(-(\frac{\pi}{2}-x))} =-\tan(x)$

Recall that since cosine is an even function, we can remove the negative. Since sine is an odd function, we can move the negative outside:

$\frac{\cos((\frac{\pi}{2}-x ))}{-\sin((\frac{\pi}{2}-x))} =-\tan(x)\\-\frac{\sin(x)}{\cos(x)} =-\tan(x)\\-\tan(x)\stackrel{\checkmark}{=}-\tan(x)$

8 0

3 years ago

Which one is the positive slope A.) (2,-3,) and (1,-2), B.) (0,0) and (3,-3), C.) (-1,-1) and (5,4) , D.) (-3,0), (9,0)

bagirrra123 [75]

Answer:

Step-by-step explanation:

Use slope = (y2-y1)/(x2-x1).

slope = (4 - -1)/(5 - -1)

slope = 5/6, positive

Hope this helps!

6 0

2 years ago

Read 2 more answers

If f(x)=2x^4-x^3-3x^2+14 then f'(3)=

Anna71 [15]

Answer:

f(3)=122

Step-by-step explanation:

4 0

2 years ago

If m^2 = 3 then what is the value of 5m^6 a. 15 b. 30 c. 45 d. 135

Virty [35]

Answer:

135

Step-by-step explanation:

m^2 = 3

Cube m^2

(m^2)^3 = 3^3

m^(2*3) = 27

m^6 = 27

Now multiply by 5

5 * m^6 = 5*27

5 m^6 =135

4 0

3 years ago