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3 years ago

How do I estimate 90.1 + 91.2 + 89.8

Mathematics

2 answers:

Nutka1998 [239]3 years ago

8 0

Answer:

270.1

Step-by-step explanation:

round to the nearest 10th or 100th if its 5 below it gone down 6 above go highter

koban [17]3 years ago

6 0

Add 90 three times and then whatever you get that’s your number

Multiply 9*3 and then add a zero( answer would be 270.1 and first then 270)

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I need help Quick!! 42-46<br> Thank you!! :)

sergiy2304 [10]

Answer:

Step-by-step explanation:

3 0

3 years ago

Solve the equation sin2x = 3cos2x. The value of x that satisfies the equation if x lies in the second quadrant is °. The value o

faltersainse [42]

Answer:

$126\degree$

and

$126\degree$

respectively.

Step-by-step explanation:

The given trigonometric equation is

$\sin2x=3\cos2x$

We divide both sides by $\cos2x$ to get,

$\frac{\sin2x}{\cos2x}=3$

This implies that,

$\tan2x=3$

We take the inverse tangent of both sides to get,

$2x=\tan^{-1}(3)$

$\Rightarrow 2x=71.565$

$\Rightarrow x=35.7825$

$\Rightarrow x\approx 36\degree$

Since the tangent ratio has a period of $180\degree$ , another solution is

$x=180+36$

$x=216\degree$ to the nearest degree.

In the third quadrant,

$2x=180+71.565$

$\Rightarrow 2x=251.565$

$\Rightarrow x=125.7825$

$\Rightarrow x=126\degree$

The solutions are

$x=36\degree,126\degree,216\degree$

The value of x that satisfies the equation if x lies in the second quadrant is $126\degree$

The value of x that satisfies the equation if x lies in the third quadrant is $216\degree$

5 0

3 years ago

Can someone plsplspls answer this question? No one has yet :')

stepan [7]

Answer:

please can u type the question I would like to explain the answer to u

7 0

3 years ago

Read 2 more answers

Your mother has a new cell phone. It comes with 18 applications already installed. She uses only of those applications. She down

agasfer [191]

If she already has 18 apps, which she uses, and downloaded 12 more, then you just add 18+12.

18+12=30

hope it helps! :3

4 0

3 years ago

PLEASE HELP<br> find the vertex of f(x)=x^2+2x+3 (make sure you show your work)

Solnce55 [7]

ANSWER

(-1,2)

EXPLANATION

The given quadratic expression is:

$f(x) = {x}^{2} + 2x + 3$

The coefficient of the quadratic term is already 1.

So we add and subtract the square of half the coefficient of x.

$f(x) = {x}^{2} + 2x + 1 - 1+ 3$

We factor the first three terms to obtain

$f(x) =(x + 1)^{2} + 2$

This is now in the form:

$f(x) = a({x - h)}^{2} +k$

where (h,k) which is equal to (-1,2) is the vertex.

5 0

3 years ago