21 its 21 because it is 21
Answer:
<h2>x = 6</h2><h2 />
Step-by-step explanation:
4x = 30 - x
5x = 30
x = 30/5
x = 6
Answer:
C) 160
Step-by-step explanation:
Set up a proportion:
= 
Cross multiply and solve for x:
15x = 3600
x = 240
This means in 400 marbles, 240 are purple.
To find how many are not purple, subtract 240 from 400:
400 - 240
= 160 marbles
So, 160 marbles are not purple
Answer:
16
Explanation:
In your parent 30 60 90 triangle, you will see that the larger leg is x times the square root of three while the shorter leg is just x, that means you would divide the longer leg by the square root of three which gives you 16 in this question.
Answer:

Step-by-step explanation:

You can confirm this by working and expanding backwards:

Hope this helps!