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11Alexandr11 [23.1K]
3 years ago
5

Please this is a test !!!!!!!!!!!!

Mathematics
1 answer:
Elza [17]3 years ago
8 0
I think it’s A or the 1st one

Good luck
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Need help with this plz
patriot [66]
B since it is 8 * -1

6 0
3 years ago
The ratio for 42 pens : 35 pencils as a fraction is
Lynna [10]
42:35 or if simplified 6:5
4 0
3 years ago
Solve the equation for principal values of x. Express solutions in degrees.
Hitman42 [59]

Option C:

x = 90°

Solution:

Given equation:

\sin x=1+\cos ^{2} x

<u>To find the degree:</u>

\sin x=1+\cos ^{2} x

Subtract 1 + cos²x from both sides.

\sin x-1-\cos ^{2} x=0

Using the trigonometric identity:\cos ^{2}(x)=1-\sin ^{2}(x)

\sin x-1-\left(1-\sin ^{2}x\right)=0

\sin x-1-1+\sin ^{2}x=0

\sin x-2+\sin ^{2}x=0

\sin ^{2}x+\sin x-2=0

Let sin x = u

u^2+u-2=0

Factor the quadratic equation.

(u+2)(u-1)=0

u + 2 = 0,  u – 1 = 0

u = –2, u = 1

That is sin x = –2, sin x = 1

sin x can't be smaller than –1 for real solutions. So ignore sin x = –2.

sin x = 1

The value of sin is 1 for 90°.

x = 90°.

Option C is the correct answer.

3 0
3 years ago
Read 2 more answers
THE ANSWER I PUT IS JUST A GUESS, IF IT ISN'T THE ANSWER PLEASE TELL ME WHAT IT IS I BEG YOU ​
Anna [14]

Answer:

the first one

Step-by-step explanation:

can you help me with my question

6 0
3 years ago
Read 2 more answers
1/2(x+10)= 1/4 (x-8) x= <br> (must be a fraction)
Alex_Xolod [135]

Answer:

x=-9\frac{1}{3}

Step-by-step explanation:

\frac{1}{2}(x+10)=\frac{1}{4}(x-8)

\frac{1}{2}x+5=\frac{1}{4}x-2

\frac{1}{2}x-\frac{1}{4}x=-5-2

\frac{3}{4}x=-7

x=-\frac{28}{3}=-9\frac{1}{3}

5 0
3 years ago
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