Answer:
Step-by-step explanation:
Let 
denotes number of pencils, markers, erasers respectively.
For Andrea:
For Justin:
For Virginia:
On subtracting equations (i) and (ii), we get
Put 
in equation (i)
Put in equation (iii)
Multiply equation (iv) by 5 and equation (v) by 6 and then subtract both the equations.
Put 
in equation
Put 
in equation (i)
Answer:
0.25 oz in 20 years
Step-by-step explanation:
Half life means its half decayed in the
the amount cuts in half every 4 year
8 oz at the start
4 oz after 4 years
2 oz after 8 years
1 oz after 12 years
0.5 oz after 16 years
0.25 oz in 20 years
6/11 Because there are 11 letters and 6 of those letters is either a P or S
Hope this helps :)
Answer:
85%
Step-by-step explanation:
So basically you divide 34 by 40. Which is 85%
If this is your grade, good job!
