Worth 10 points people!!

5b - 0.9b is the equivalent expression and the distributive property is used.

Step-by-step explanation:

The price of bread is marked down 18%. She purchases 5 loaves of bread. We need to rewrite the above expression.

The expression that is used to find the price of 5 loaves of bread is 5(b-0.18b).

We can use the distributive property to solve it as follows:

a(b+c) = ab + ac

Here, a = 5, b = b and c = -0.18b

5(b-0.18b) = 5(b) + 5(-0.18b)

= 5b - 0.9b

So, the equivalent expression is 5b - 0.9b. The distributive property was used to rewrite the expression.

b. astronomers