Answer:
10
Step-by-step explanation:
30/100*x=3
Multiply both sides by 100 and divide both by 30
You get the answer x=10
Answer:

Step-by-step explanation:
step 1
Find the value of y
we know that
In the right triangle of the figure

Remember that

so

Simplify

step 2
Find the value of x
In the right triangle of the figure

Remember that

so


Answer:
Step-by-step explanation:
3+5+7 = 15 total marbles
3 are red
so she has a 3/15 reduces to 1/5 probability of picking a red one
Answer:
Sorry I could only find the answer to the second part.
y=56x