Answered

IDNLearn.com: Your reliable source for finding expert answers. Get timely and accurate answers to your questions from our dedicated community of experts who are here to help you.

dans parents are going to pay for half his car if he gets a 90 average in math for all four marking periods and the final exam. Here are his grades for the first four quarters: 91,83,90 and 89. What grade does he need on his final exam to have a 90 average?

Dans Parents Are Going To Pay For Half His Car If He Gets A 90 Average In Math For All Four Marking Periods And The Final Exam Here Are His Grades For The First class=

Sagot :

Charlief22idn

Answer:

Above 97.

Step-by-step explanation:

The average of something is the total values divided by the number of values added together so:

Step 1 - Add the four values together:

Let x be the unknown final exam grade

91 + 83 + 90 + 89 + x

353 + x

Step 2 - Find the average value:

[tex]\frac{353 + x}{5} = 90[/tex]

Step 3 - Simplify by multiplying both sides by 5:

[tex]\frac{353 + x}{5} * 5 = 90 * 5[/tex]

[tex]353 + x = 450[/tex]

Step 4 - Isolate x:

[tex]353 + x = 450[/tex]

x = 450 - 353

x = 97

So his grade must be above 97.

Hope this helps!

Your presence in our community is highly appreciated. Keep sharing your insights and solutions. Together, we can build a rich and valuable knowledge resource for everyone. Thank you for trusting IDNLearn.com with your questions. Visit us again for clear, concise, and accurate answers.