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yan [13]
3 years ago
5

Please , I didn't have time to study. god bless to all <3

Mathematics
1 answer:
Naily [24]3 years ago
3 0
This is the first half of the question.
Let's solve your equation step-by-step.5x=9x3+2x2−5x+4Step 1: Subtract 9x^3+2x^2-5x+4 from both sides.5x−(9x3+2x2−5x+4)=9x3+2x2−5x+4−(9x3+2x2−5x+4)−9x3−2x2+10x−4=0Step 2: Use cubic formula.x=−1.31953Answer:<span>x=<span>−1.31953


</span></span>
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Answer the question in the picture
nekit [7.7K]

Recall the angle sum identities:

\sin(x+y)=\sin x\cos y+\cos x\sin y

\cos(x+y)=\cos x\cos y-\sin x\sin y

Now,

\tan(x+y)=\dfrac{\sin(x+y)}{\cos(x+y)}=\dfrac{\sin x\cos y+\cos x\sin y}{\cos x\cos y-\sin x\sin y}

Divide through numerator and denominator by \cos x\cos y to get

\tan(x+y)=\dfrac{\tan x+\tan y}{1-\tan x\tan y}

Next, we use the fact that x,y lie in the first quadrant to determine that

\sin x=\dfrac12\implies\cos x=\sqrt{1-\sin^2x}=\dfrac{\sqrt3}2

\cos y=\dfrac{\sqrt2}2\implies\sin x=\sqrt{1-\cos^2x}=\dfrac1{\sqrt2}

So we then have

\tan x=\dfrac{\sin x}{\cos x}=\dfrac{\frac12}{\frac{\sqrt3}2}=\dfrac1{\sqrt3}

\tan y=\dfrac{\sin y}{\cos y}=\dfrac{\frac1{\sqrt2}}{\frac{\sqrt2}2}=1

Finally,

\tan(x+y)=\dfrac{\frac1{\sqrt3}+1}{1-\frac1{\sqrt3}}=\dfrac{1+\sqrt3}{\sqrt3-1}=2+\sqrt3\approx3.73

4 0
3 years ago
6. The table shows the number of manatee deaths caused by watercraft in Florida each year
erik [133]

Answer: quadratic model, 0.866

Step-by-step explanation:

8 0
3 years ago
Alyssa bought 5 bags of pretzels and a case of water for $16. The case of water was on sale for $3. How much was each bag of pre
AlekseyPX
The answer is $2.6 dollars
4 0
3 years ago
There are 72 South American animals in the Springdale zoo. Thats is more than half the number of African animals in the zoo. Wri
natita [175]
172 = 1/2 * x + 45
172 = 1/2x + 45             / - 45 (both sides)
127 = 1/2x                    / * 2 (both sides)
x = 254
8 0
3 years ago
What does 54/300 equal as a decimal?
maks197457 [2]

Answer: 0.18

Step-by-step explanation:

look it up i did on Desmos

8 0
3 years ago
Read 2 more answers
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