Latisha wants to get at least a b+ in her history class. to do so, she needs to have an overall average of at least 86%. so far, she has taken three tests and has gotten scores of 90%, 82%, and 81%. a. use the 5-d process to latisha determine what percent score she needs on the fourth test to get the overall grade that she wants. the fourth test is the last test of the grading period. b. the teacher decided to make the last test worth twice as much a regular test. how does this change the score that latisha needs on the last test to get an overall average of 86%? support your answer with mathematical work.

A. 91

b. This makes the last test 40% of her grade and the rest of the tests 20%.

Step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

total of apples - take away four

6-4 = 2

answer is 2 apples