Lashonda has scored 69 , 65, and 77 on her previous three tests. What score does she need on her next test so that her average (mean) is 69?

65

Step-by-step explanation:

We know that her three tests are 69,65,77 so far

in order to get her average at 69 we need to do the following:

69+65+77+x=(69x4)

211+x=276

x=276-211=65

if she will get a 65 her average will be 69

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3