Answer:
a) 20
Step-by-step explanation:
Use similar triangles.
2/3 = x/30
3x = 2 * 30
3x = 60
x = 20
Answer: a) 20
Answer:
b=4
Step-by-step explanation:
3b-4b+3+1=0
-b=-4
b=4
For this case we must resolve the following inequality:

Subtracting 7 from both sides of the inequality we have:

Dividing by 3 to both sides of the inequality we have:

We multiply by -1 on both sides, taking into account that the sense of inequality changes:

Thus, it is observed that to solve the inequality it is necessary to change the meaning of it.
ANswer:
False. It is necessary to change the sense of inequality
Answer:
9in Squared
Step-by-step explanation:
a square is 4 equal length sides, 12 / 4 = 3, then multiply two sides of the square, 3 x 3 = 9.