Step-by-step explanation:
Sn=n/2(2a+(n-1)d)
910=n/2{2a+(n-1)d}
1820=n{2a+(n-1)d}
1820=20{2a+(20-1)d}
1820=20{2a+19d}
91=2a+19d
An=a+(n-1)d
95=a+(20-1)d
95=a+19d
91=2a+19d
---------------
4=-a
a=-4
91=2a+19d
91=2(-4)+19d
91=-8+19d
91+8=19d
99=19d
d=99/19
A=-4
It would be about 17, I think
$8250 - $3120 = $5130
$5130/75 = $68.40
Each band member must raise $68.40
Answer:
Its 11.50 per shirt
Step-by-step explanation:
We know this because if you do 46/4 = 11.50 and if you do 80.50/7 = 11.50 as well
