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stiv31 [10]
3 years ago
11

2. CAN SOMEONE PLEASE HELP ME? I'M NOT GOOD IN MATH.Explain your work​

Mathematics
1 answer:
Elodia [21]3 years ago
6 0

Answer:

D

Step-by-step explanation:

Since triangles ABC and CDB are similar, CD and CB is the same as the ratio between CB and CA. 15:9=x:15. x=25. Subtracting CD to just be left with AD, we get 25-9=16, or answer choice D. Hope this helps!

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A triangle has one Angle that measures 31° one angle that measures 45° and one angle that measures 140° what kind a triangle is
qaws [65]

unequal Triangle

If two sides of a triangle are unequal, The angle opposite to the greater side is greater than the angle opposite to less.That is,

In a triangle ΔABC,

if AC > AB then ∠B > ∠C

6 0
3 years ago
If a+b+c=0 for a,b,c then prove a²/bc+b²/ca+c²/ab=3.
Ierofanga [76]
According to the identity if a+b+c=0
then a3+b3+c3=3abc
a3+b3+c3/abc=3
a2*a/bc*a+b2*b/ca*b+c2*c/ab*c=3
cancel a,b,c in   all the fraction then you get
<span>a²/bc+b²/ca+c²/ab=3. 
</span>hence proved


5 0
3 years ago
Limited time . 10 points
AfilCa [17]

Answer:

Therefore the value of x is

x=1\pm\sqrt{19}i

Step-by-step explanation:

Given:

x^{2}+20=2x which is

x^{2}-2x+20=0

To Find:

x = ? using Quadratic Formula

Solution:

For a Quadratic Equation ax² + bx + c = 0 , Formula Method is given as

x=\dfrac{-b\pm\sqrt{b^{2}-4ac}}{2a}

On Comparing with above we get

a=1\\b=-2\\c=20

Substituting a , b , c in Formula method we get

x=\dfrac{-(-2)\pm\sqrt{(-2)^{2}-4(1)(20)}}{2\times 1}\\\\x=\dfrac{2\pm\sqrt{-76}}{2}\\\\x=\dfrac{2\pm2\sqrt{19}i}{2}\\Dividing\ by\ 2\ we\ get\\\\x=1 \pm\sqrt{19}i

Therefore the value of x is

x=1\pm\sqrt{19}i

8 0
3 years ago
Find the following angles. angles Q, ARB, PRQ <br>I will mark brainlist ​
Allisa [31]

Answer:

it is very simple we can answer it's to simple

Step-by-step explanation:

let me explain

for it is straight

for arb it is also simple you have to do arb because there is made triangle

prq there is also a triangle

now please mark me as brainlist

3 0
3 years ago
Find the values of x and y. y=? x=? PLEASE HELP
Molodets [167]

Answer:

x=15.714

y=5.715

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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