Someone pls help ive been stuck for forever

Mathematics

1 answer:

shepuryov [24]3 years ago

4 0

This is a triangle. The interior angles of a triangle always add up to 180 degrees. Thus, write an equation representing the sum of the given angles, with "180 degrees" on the right side.

4x-1 + 8x+2 + 71 = 180 degrees.

Solve for x!

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What is the area of this triangle? (Image Attached)

Snezhnost [94]

$\bf \textit{Law of Cosines}\\ \quad \\
c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\implies 
c = \sqrt{{{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)}\\\\
-----------------------------\\\\
\textit{so, let's find the missing side}
\\\\\\
c=\sqrt{2.7^2+3.4^2-2(2.7)(3.4)cos(40^o)}
\\\\\\
c=\sqrt{4.78542402433556327368}\implies c\approx 2.187561204706182220$

or we can round it, to say c = 2.19, so hmm that's the missing side
now, we use Heron's Formula, which uses all 3 sides only

$\bf \textit{Heron's Area Formula}\\\\
A=\sqrt{s(s-a)(s-b)(s-c)}\qquad 
\begin{cases}
a=2.7\\
b=3.4\\
c\approx 2.19\\\\
s=\cfrac{a+b+c}{2}
\end{cases}$

and that'd be the area of it

6 0

3 years ago

Read 2 more answers

Solve for b.<br> -11b + 7 = 40<br> b =

uysha [10]

Answer:

The chosen topic is not meant for use with this type of problem. Try the examples below.

|2y| = 3 + 2

− 2 (y+2) = 2 −y

x−2=4

Step-by-step explanation:

7 0