TRY beating an answer expert! If 20 articles cost ? 90, then the cost of 9 articles is ? ? 45
? 4.50
? 40.50
? 42

45

Step-by-step explanation:

C) $40.50

Step-by-step explanation:

It is given to you that 20 articles cost $90. Find the unit cost of the articles. Divide the total cost of the articles with the amount of articles there are:

$90/(20 articles) = $4.50/article.

Each article costs $4.50 each.

Next, find the cost of 9 articles. Multiply the total amount of articles with the unit cost:

4.50 x 9 = 40.50

C) $40.50 is your answer.

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the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).

nope lol

step-by-step explanation: