Anna earned an 84 for the first trimester of math. She earned a 87 for the 2nd trimester and a 90 for the 3rd trimester. Find the mean of her trimester grades.

87

Step-by-step explanation:

To find the mean, add up all her grades for the 3 trimesters, and then divide by the number of grades.

Total of her Grades

Add up all her grades

84+87+90

261

Divide

Then, divide the total of her grades by the number of grades, which is 3.

261/3

87

So, the mean for her trimester grades is 87

x

step-by-step explanation:

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.