The substance of 256 gm will be decayed into 1 gm in 800 years.
Step-by-step explanation:
Given,
The substance decays 75% in every 600 years.
Amount of substance = 256 gm
To find the the time the substance to decay to 1 gm.
Now,
75% decay in 600 years
1% decays in 600÷75 years
100% decays in 
×100 years
= 800 years
Hence,
The substance of 256 gm will be decayed into 1 gm in 800 years.
1)ABCD is a parallelogram
2) AB congruent DC
3) AE congruent EC
4) DE congruent EB
5)Triangle ABE is congruent to Triangle CDE
Answer:
<h3>8 and 13</h3>
Step-by-step explanation:
Let the two numbers be x and y
If the two numbers differs by 5, then;
y-x = 5 ...1
x is the smaller
y is the larger
If seven times the smaller plus four times the larger is 108, this is expressed as;
7x + 4y = 108 ... 2
From 1;
y = 5 + x .... 3
Substitute 3 into 2;
From 2;
7x + 4y = 108
7x + 4(5+x) = 108
7x + 20 + 4x = 108
11x + 20 = 108
11x = 108-20
11x = 88
x = 88/11
x = 8
Since y = 5+x
y = 5 + 8
y = 13
hence the numbers are 8 and 13
Answer:4y
I got the same answer as the other person but here’s a explanation
Explanation: when subtracting something that’s already a negative it just adds instead, I’ve learned to think of it as looking like a giant plus mark “-(-“ so basically y+3y= 4y
