All categories

4 years ago

Find the measure of angle J .will mark brainiest

Mathematics

2 answers:

zhenek [66]4 years ago

6 0

Answer:

<J=51°

Step-by-step explanation:

3x-2+4x-9+3x-9=180

10x-20=180

10x=200

x=20

<J=3x-9=3(20)-9=60-9=51°

Alex Ar [27]4 years ago

4 0

Answer: Angle J = 51°

Step-by-step explanation: All angles add up to 180° in a triangle, so add every angle and set it equal to 180°.

(3x - 2) + (3x - 9) + (4x - 9) = 180

Add like terms:

10x - 20 = 180

Add 20 to both sides:

10x = 200

Divide both sides by 10:

x = 20

Now, plug x into angle J:

3(20) - 9

60 - 9

Angle J = 51°

Hope this helps!

You might be interested in

Thanks if you help out

Ivenika [448]

6.40=4n

6.4/4 = 4n/4

n=$1.60

n= notebook
p=price in $

Final Answer: $1.60 per notebook

8 0

3 years ago

What's the answer??

Vilka [71]

The answer is neither. i hope this helps

8 0

3 years ago

Find the circumference of the circle. Use π=3.14

Masteriza [31]

The circumference formula for a circle is 'c=2πr'.

C = circumference
π = 3.24
r = radius (1/2 the diameter)

All you need to do is plug in the numbers you are given. So the circumference = (2)(3.14)r

5 0

3 years ago

Meg rowed her boat upstream a distance of 45 mi and then rowed back to the starting point. The total time of the trip was 14 hou

Montano1993 [528]

Recall your d = rt.

so hmm is about the same as the other one... so say the boat has a speed rate of "b", well, going downstream the boat goes say " b + 2 ", because the current is adding to it, and going upstream is " b - 2 " because the current is eroding from it.

So if the whole trip took 14 hours, say it took "t" hours going upstream, then going downstream it took the slack or " 14 - t ".

Also notice, the trip forth and back is the same 45 miles.

$\bf \begin{array}{lccclll}
&\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\
&------&------&------\\
Upstream&45&b-2&t\\
Downstream&45&b+2&14-t
\end{array}
\\\\\\
\begin{cases}
45=t(b-2)\implies \frac{45}{b-2}=\boxed{t}\\\\
45=(b+2)(14-t)\\
----------\\
45=(b+2)\left( 14- \boxed{\frac{45}{b-2}}\right)
\end{cases}
\\\\\\
\cfrac{45}{b+2}=14- {\cfrac{45}{b-2}}\implies \cfrac{45}{b+2}=\cfrac{14(b-2)~-~45}{b-2}$

$\bf \cfrac{45}{b+2}=\cfrac{14b-28-45}{b-2}\implies \cfrac{45}{b+2}=\cfrac{14b-73}{b-2}
\\\\\\
45(b-2)=(b+2)(14b-73)\implies 45b-90=14b^2-45b-146
\\\\\\
0=14b^2-90b-56\implies 0=7b^2-45b-28
\\\\\\
0=(7b+4)(b-7)\implies b=
\begin{cases}
-\frac{4}{7}\\\\
\boxed{7}
\end{cases}$

6 0

3 years ago

What is 531 x 321 x 345???

earnstyle [38]

The answer to that is 58,805,595 . hope this helps !!!

7 0

3 years ago

Read 2 more answers

Find the measure of angle J .will mark brainiest​

Find the measure of angle J .will mark brainiest