So I have an 89% in my science class and we took a test worth 15 points. I only got 8 correct which is an F. I have 2 A's, a B, and a D as the other grades in the grade book. How will this F affect my grade? I need it to stay a B

To determine how this F will affect your overall grade, you will first need to know the weightage of each grade category in your science class. Different assignments, tests, or exams may have different weightages. Once you have this information, you can calculate your current grade based on the weights assigned to each category.

For example, let's say the A grades are each worth 25% of your final grade, the B grade is worth 20%, the D grade is worth 15%, and the test is worth 15%.

To calculate your current grade without the test:

(A1 * weight1) + (A2 * weight2) + (B * weightB) + (D * weightD) = current grade

Let's assume your A1 grade is 95%, A2 grade is 90%, B grade is 85%, and D grade is 60%. With the given weights, let's also assume A1 has a weight of 25%, A2 has a weight of 25%, B has a weight of 20%, and D has a weight of 15%.

To calculate your current grade without the test:

(95 * 25%) + (90 * 25%) + (85 * 20%) + (60 * 15%) = current grade

Now, suppose your current grade without the test is 89.2%.

To calculate your final grade including the test:

(current grade without the test * weight without the test) + (test grade * weight of the test) = final grade

Using the values given above, plug them into the formula:

(89.2 * 85%) + (F * 15%) = final grade

Since you received 8 out of 15 on the test, your test grade would be 8/15 = 0.533.

Plug in this value into the equation:

(89.2 * 85%) + (0.533 * 15%) = final grade

Now calculate:

75.82 + 0.08 = final grade

So, your final grade is 75.90%.

Based on your target of maintaining a B grade, which usually corresponds to a range between 80% and 89.99%, it seems that this F will lower your grade below that range.

Keep in mind that the weights of the categories are hypothetical, and you should refer to your class syllabus or consult your teacher to know the accurate weights for each category in order to get a precise calculation.