Multiply the tops and multiply the bottoms
Aka
5*21
-------
7*25
And simplify
Answer:
N=250
Step-by-step explanation:
"twice as many nickels as dimes" means N =2D [eq1]
"collection of nickels and dimes is worth $25" means
5N + 10D = 2500 [eq2]
(To avoid using decimal points, PLZ express everything in cents.)
Substitution (substitute N from eq1 into eq2]:
5(2D) + 10D = 2500
10D + 10D = 2500
20D = 2500
D = 125
N=2D [eq1 again]
N=2(125)
N=250
Check:
Is 5(250) + 10(125) = 2500 ?
1250 + 1250 = 2500 ?
2500 = 2500 ?yes
68% you have to divide 17 by 25 and then move the decimal
L=k/r^2,
r^2 is the denominator cause L varies inversely with the square of distance
The answer is B
I don't get what you mean by "with decimals" but it would be 1