To change a percent<span> to a </span>fraction<span>, </span>use<span> the given </span>percent<span> as the numerator of a</span>fraction<span> and </span>100<span> as the </span>denominator<span> and then reduce the </span>fraction<span>. Examples: To change a </span>percent<span> to a decimal, </span>use<span> the given </span>percent<span> as the numerator of a</span>fraction<span> and </span>100<span> as the </span>denominator<span> and then </span>write<span> the </span>fraction<span> as a decimal</span>
Answer:
answered
Step-by-step explanation:
N+d=21
5n+10d=170
so
multiply first equation by -5 and add to other one
-5n-5d=-105
<u>5n+10d=170 +</u>
0n+5d=65
5d=65
divide both sides by 5
d=13
sub back
n+d=21
n+13=21
minus 13 both sides
n=8
8nickles
13 dimes
Answer:
The answer is that the elevator stopped at the 7th floor
Step-by-step explanation:
Answer:
Step-by-step explanation:
Find the sum of the first 42 terms of the following series, to the nearest integer.
2,7,12
Solution
The sum is given by
SUM_n=n/2*(a_1+a_n)
a_n=a_1+(n-1)d
a_1=2, n=42, d=5
The 42nd term is therefore given by
a_42=2+(42-1)5=207
SUM_42=42/2*(2+207)=21*209=4389
The sum of the first 42 terms of the series, therefore, is 4389
