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Answer:
Identity property of multiplication
Step-by-step explanation:
From step 5:

Here, to solve for x so that the variable x stands alone, Alberto uses the identity property of multiplication, which justifies what he has in step 6.
Step 6:

According to the identity property of multiplication, any value you multiply by 1 gives you that same value.
Therefore, 1x = 1 × x = x.
The variable x multiplied by 1 will give you x.
42 is 21% of 200. This is because 200*0.21 = 42.
Answer:
c.
Step-by-step explanation:
Answer:
S = a² => 20 = a² => a = √20 ≈ 4.5 cm
Step-by-step explanation: