20 - 12 = 8
He has 8 blue and yellow crayons altogether.
Yellow = x
Blue = 2 + x
2 + x + x = 8
2 + 2x = 8
Subtract 2 to both sides
2x = 6
Divide 2 to both sides
x = 3.
He has 3 yellow crayons.
4000. 25000 x .16 is 4000
The cost of 12 units would be $614.40.
This is found by dividing $204.80 by 4 to get $51.20 (cost per single unit), then multiplying $51.20 by 12 to get $614.40 (cost for 12 units).
I hope this helps!
The sequence is arithmetic as it goes down 3 every time
Arithmetic nth term formula is an=a1+d(n-1)
an=7-3(n-1)
an=7-3n+3
an=-3n+10
To find the 100th term substitute n for 100
a100=-3(100)+10
a100=-300+10
a100=-290
The 100th term is -290
