Answer:
1. 4 and 1/6
2. 2 and 11/12
Explanation:
convert to improper fraction: 11/2 - 4/3
same denominator: 33/6 - 8/6
subtract: 25/6
convert to mixed number: 4 and 1/6
8x² - 4 = 28
8x² = 28 + 4
8x² = 32
x² = 32/8
x² = 4
x = <span>±2
</span>
S = n(a1 + an)/2
2S = n(a1 + an)
2S = na1 + nan
nan = 2S - na1
an = (2S - n a1)/n
