Answer:
let the numbers be xy
general form of the number =10x+y
sum of digits of a number =14
x+y=14………[1]
if 18 is added to the number, then digits are interchanged
10x+y+18=10y +x
9x-9y=-18
X-y=-2………[2]
the linear equations are 1) x+y=14
2) X-y=-2
adding [1],[2]
2x=12
x=6
x+y=14
y=14-x
y=14-6
y=8
there fore the number =10*6+8
=68
check:-
1)6+8=14
2)68+18=86
I hope this helped!
Step-by-step explanation:
Answer:
The fraction will decrease 
Step-by-step explanation:
Let
x/y ----> the fraction
we know that
100%-50^=50%=50/100=0.50
100%-25%=75%=75/100=0.75
substitute

therefore
The percent that the fraction will decrease is equal to

Answer:
<em>n</em><em> </em><em>=</em><em> </em><em>-5</em>
Step-by-step explanation:
<em>Just</em><em> </em><em>divide</em><em> </em><em>both</em><em> </em><em>sides</em><em> </em><em>with</em><em> </em><em>-0</em><em>.</em><em>8</em>
<em>:</em><em>)</em><em> </em>