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3 years ago

Plz help with this problem I need to find the length of CB???

Mathematics

2 answers:

miss Akunina [59]3 years ago

5 0

$tan(30)=0.57735026919 \\ 0.57735026919= \frac{x}{20}$
Multiply by 20 on both sides
$0.57735026919*20= \frac{x}{20} *20 \\ 11.5470053838=x \\ 11.5=x$
and x = side CA
Next you now know the hypotenuse of the other "triangle"
It's Adjacent and hypotenuse
So that's cos
$cos(60)= \frac{x}{11.5} \\ 0.5= \frac{x}{11.5}$
multiply by 11.5 on both sides
$0.5*11.5= \frac{x}{11.5} * 11.5 \\ 5.75 = x$
x= side CB
CB=5.75m

dezoksy [38]3 years ago

4 0

CB is equal to 10m you can tell this bye the side DC being 20 m and the angle of DC is half of CB so that means that CB has to be 10 m

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What is solution to the system of equations? Y=5×+2 3×=-y+10

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Y = 5x + 2
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3x = y + 10
3x = 5x + 2 + 10
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3x - 5x = 12
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substitute x = -6 into y = 5x + 2

y = 5(-6) + 2
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x = -6, y = -28

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Step-by-step explanation:

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3 years ago

Read 2 more answers

How do you solve -2(x + 3y) = 18

sergiy2304 [10]

solving equation in terms of x we get $x=-9-3y$

solving equation in terms of y we get $y=-3-1/3x$

Step-by-step explanation:

We need to solve the equation: $-2(x + 3y) = 18$

Solving the equation:

$-2(x + 3y) = 18\\-2x-6y=18$

Simplifying and finding value of x:

$-2x-6y=18\\-2x=18+6y\\-2x/-2=18/-2+6y/-2\\x=-9-3y$

We can simplify and find value of y as well:

$-2x-6y=18\\-6y=18+2x\\-6y/-6=18/-6+2x/-6\\y=-3-1/3x$

So, solving equation in terms of x we get $x=-9-3y$

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Keywords: Solving Equations

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#learnwithBrainly

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2 years ago

Find the degree of the polynomial: a^3+3a^2−5a

emmainna [20.7K]

Answer:

The degree of the polynomial is 3

Step-by-step explanation:

Given:

$a^3+3a^2-5a$

To Find:

The degree of the polynomial= ?

Solution:

The degree of the polynomial is the value of the greatest exponent of any expression (except the constant ) in the polynomial. To find the degree all that you have to do is find the largest exponent in the polynomial

Here in the given polynomial

$a^3+3a^2- 5a$

The terms are

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$5a$

The term $a^3$ has the largest exponent of 3

Note: The degree of the polynomial does not depend on coefficients of the terms

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