on his first three tests, ken scored 83,79, and 96. what score must he get on his fourth test to have an average (mean) of
80 for all four tests?

62

Step-by-step explanation:

average =

Let x represent his fourth score, then

= 80, that is

= 80 ( multiply both sides by 4 )

258 + x = 320 ( subtract 258 from both sides )

x = 62

He must obtain a score of 62 in his fourth test

step-by-step explanation:

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40