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3 years ago

What is the value of y? Plz helppp someone

Mathematics

1 answer:

Mkey [24]3 years ago

7 0

Answer:

y = 55 degrees.

Step-by-step explanation:

the angles of a triangle add up to 180 degrees, so

40 + y + y + 30 = 180

2y = 180 - 70

2y = 110

y = 55.

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Find the solution of the equation -3x^2+6x-11

disa [49]

Answer:

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Step-by-step explanation:

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3 years ago

Option 2: Find m < C. Show all work.

maksim [4K]

Answer:

m∠C = 28.1°

Explanation:

angle m∠C has opposite angle of 16 and hypotenuse of 34

using sine rule:

$\boxed{ sin(C) = \frac{opposite}{hypotenuse}}$

$sin(C)=\frac{16}{34}$

$C = sin^{-1}(\frac{16}{34} )$

C = 28.07248°

C = 28.1°

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3 years ago

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The value of x in the equation log(x-1)9=2 is

mel-nik [20]

$\log_{(x-1)} 9=2$

the domain:
$x-1 >0 \ \land \ x-1 \not=1 \\
x>1 \ \land \ x \not= 2 \\
x \in (1; 2) \cup (2;+\infty)$

the equation:
$\log_{(x-1)}9=2 \\
(x-1)^2=9 \\
\sqrt{(x-1)^2}=\sqrt{9} \\
|x-1|=3 \\
x-1=3 \ \lor \ x-1=-3 \\
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4 is in the domain
-2 is not in the domain

The answer:
$x=4$

***
Also, the answer in 13 is {8}. -3 is not in the domain. Replace x with -3 and you'll see:
$x=\sqrt{5x+24} \\
-3=\sqrt{5 \times (-3)+24} \\
-3=\sqrt{-15+24} \\
-3=\sqrt{9} \\
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It's not true so -3 isn't a solution to this equation.

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3 years ago

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saul85 [17]

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