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
Answer:
just practice time and again practice might not make perfect but it surely makes better. relying when your teacher only might not help you must mostly rely on your hard work and also have people at your disposal to help you including the said teacher hope you'll improve
<span> -k - (-8k) = -k + 8k = 7k</span>
Answer:
1/3
Step-by-step explanation:
Rolling a die has the possible outcomes of 1,2,3,4,5,6 = 6 total
P(3 or 5) = number of 3 or 5's / total
= 2/6
= 1/3
Answer:
Rational,integer
Step-by-step explanation: