We can solve this problem by the rule of three.
45 boys-------------100 %
18 boys-------------- x
x=(18 boys * 100%) / 45 boys=40 %
Answer: 40% of the boys play de drums.
Answer: Hello!
Here you have 53 integrated circuits, each with a probability of 0.02 of being defective.
If only one of them is defective, then the electronic product doesnt work.
Then we need the calculate the probability in wich all the 53 circuits arent defective.
the probability for each one to not be defective is 1 - 0.02 = 0.98
And if i want to see the probability for all of them to work fine, then i need to do the product of all the probabilities, this is multiply 0.98 53 times, or:

rounding to the four decimal place, we have: 0.3428
Wich is a kinda small probability for our product to work.
No because the maximum amount for sin and cos is 1.if alpha is 90 and beta is 0 the answer is 7 so it's not right.
First you set up the problem- 7/12=x/100. then you cross multiply 7×100=700 then divide 12 into 700 so 700÷12=58.333333333333 and so your percentage is 58.3%
Answer: 4/5
Step-by-step explanation:
80% is 80/100
80/100 simplified is 4/5