The answer is 14
0.4r-7=-.3r+2.8
Add 7 to both sides. -7+7=0 so it cancels on the left. 2.8+7=9.8.
0.4r=-.3r+9.8.
Add .3r to both sides. -.3r+3r=0 so it cancels on the right. 0.4r+.3r=0.7r.
0.7r=9.8
Divide 0.7 to both sides. 9.8 divided by 0.7 = 14
So r=14
Step-by-step explanation:
I assume AB is supposed to be a straight line. yes ?
in that case please remember that all angles on top of a line (and then again below a line) must sum up to 180 degrees (this is what it takes to flip a "stick" on that line from left to right).
so, COD covers already 90 degrees of these 180.
that means AOD + BOC = 180 - 90 = 90 degrees.
now we know that the 2 angles are in the ratio of 1:5.
that means that BOC is 5 times as large as AOD.
and we can be more direct :
since the 2 angles are in the ratio 1:5 we are actually splitting the remaining 90 degrees into 6 parts (5+1).
and BOC gets then 5 of these 6 parts, and AOD gets the remaining 1 part.
so,
90/6 = 15
therefore, one of these parts is 15 degrees.
so, we know AOD = 15 degrees.
BOC = 5×15 = 75 degrees
or simply 90 - 15 = 75 degrees
Answer:
Step-by-step explanation:
the given expression is equivalent to (-9/4) / [-2/3] = (-9/4)*(3/2) = 27/8
24x-1+20x+5=180
44x+4=180
44x=176
x=4
Therefore, 20x+ 5 is equivalent to 20(4)+5
20(4)+5
80+5
85
Hope this helps :)
Answer:
x = 3
Step-by-step explanation:
4x + 3 = 5x
4x = 5x - 3
4x - 5x = -3
(4 - 5)x = 1x
-1x = -3
x = -1 × (-3)
<u>x</u><u> </u><u>=</u><u> </u><u>3</u>
