31% × y = 89,9
y = 89,9 × 100/31
= 290
Therefore 31% of 290 is 89,9
<span>hope this helps !
20/((cos(5*x))^2)</span>
Answer:
4
Step-by-step explanation:
;)
Answer: $0.24
Step-by-step explanation:
9.5 inches --> $2.28
1 inch--->X
now cross multiply it and get,
9.5X = 2.28*1
X = 2.28/9.5
so its $0.24 per inch
Let N be the number of blue counters. This implies that 3N counters are red, and there are 4N counters in total.
Assuming that you don't reinsert the first counter, for the first pick, you have N blue counters over 4N total counters, so you'll pick a blue counter with probability
For the second pick, you're left with N-1 blue counters over 4N-1 counters, so you'll pick a blue counter with probability
The probability of picking two blue counters with two picks is the product of the two probabilities:
And we want this to equal 1/20, so we have
We can expand the left hand side and solve for N:
So, there are 4 blue counters and 12 red counters, for a total of 16 counters in the bag.
We can indeed verify that the probabilities of picking the two blue counters is