Answer:
Step-by-step explanation:
Sum of all the angles of 12 sided polygon= (n -2)*180
= (12 - 2 )*180 = 10 * 180 = 1800
Four interior angle each of xº + 8 interior angles each of 2xº = 1800
4*x + 8*2x = 1800
4x + 16x = 1800
20x = 1800
x = 1800/20
x = 90°
Answer:
A. x=3, y= -6
Step-by-step explanation:
x - 2y = 15
2x + 4y= -18
<em>Solving for x</em>
x-2y=15
<em>Subtract x from both sides</em>
-2y= -x+15
<em>Multiply both sides by -1</em>
2y=x-15
<em>Multiply both sides by 2</em>
4y=2x-30
2x+4y= -18
<em>Subtract 2x from both sides</em>
4y= -2x-18
<u>Combine equations:</u>
-2x-18=2x-30
<em>Add 2x to both sides</em>
-18=4x-30
<em>Add 30 to both sides</em>
12=4x
4x=12
<em>Divide both sides by 4</em>
x=3
Solving for y
x-2y=15
<em>Add 2y to both sides</em>
x=2y+15
<em>Multiply both sides by 2</em>
2x=4y+30
2x + 4y= -18
<em>Subtract 4y from both sides</em>
2x= -4y-18
<u>Combine equations:</u>
-4y-18=4y+30
<em>Add 4y to both sides</em>
-18=8y+30
<em>Subtract 30 from both sides</em>
8y= -48
<em>Divide both sides by 8</em>
y= -6
Answer: -112
Step-by-step explanation:
Given: Rate of lost money on an investment = $4 per day.
Since 1 week = 7 days
So, Amount of money she lost in 1 weeks = $ 4 x 7 = $28
⇒ Amount of money she lost in 4 weeks = $ 28 x 4 = $112
Since in integers, a loss is represented by negative integer.
So, Mrs. Rockwell lost $112 after 4 weeks which is represented by "-112" integers.
Answer:
Okay!
Step-by-step explanation:
Let's solve for x
5x+2y=3
Step 1: Add -2y to both sides.
Step 2: Divide both sides by 5.
(See attachment for answer :)
Answer:
10 Years old
Mark brainliest???
Step-by-step explanation:
24 twice my sisters age is 12 less than 2 is 10
