So we know that an average is the sum of the scores divided by the number of scores that were added together. In this case we are going to be dealing with 4 tests. So let's say x is the score for our fourth test. We can create this equation:

$\frac{x+43+48+42}{4}=50$

So then we need to simplify the top:

$\frac{x+133}{4}=50$

Then multiply by 4 on both sides to get rid of the denominator:

$x+133=200$

Then solve for x:

$x=67$

So now we know that Sam needs to score a 67 on the fourth test to have an average score of 50.

6 0

3 years ago

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What is the exact area of a circle with a diameter of 64 m?

torisob [31]

The answer would be 45

5 0

3 years ago

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I need help finding the answers for all of these, I've been stuck on it for the last 30 minutes

Vinvika [58]

Answer:

Ray: A

Vertex:AC

Angle:ABX

Parallel lines:CFB FCB BCF

Parallel planes:BCC

Coplanar points:A F

Colliner points:C D E F

Segment addition postulate:ANB

Prependicular:????

7 0

3 years ago

Which set of numbers is range in decreasing order

rosijanka [135]

Originally, both range() and xrange() produced numbers that could be iterated over with ... whereas reversed() is generally used to loop over a sequence in reverse order. ... Once you have it installed, put in the following:.

6 0

3 years ago