Answer:
x = 6
Step-by-step explanation:
Given
+ 4 = 7 ( subtract 4 from both sides )
= 3 ( square both sides )
2x - 3 = 3² = 9 ( add 3 to both sides )
2x = 12 ( divide both sides by 2 )
x = 6
0.6666 and if you want to make it easier just say 0.70 or 0.66
So the test he scored lowest is 69 so discard this score and put x for it
average=numbers added together then summ is divided by number of numbers exg
average of 2 and 4 and 5 is 2+4+5=11 then 3 numbers so 11/3 is average or aprox 3 and 2/3 so
=average
he wants his new average to be at least 82 so
solve
treat as equation
first add like terms in top
multiply both sides by 5 to clear fraction
325+x
410
subtract 325 from both sides
x
85
he must get
85 to get an average of at least 82
Answer:
420
Step-by-step explanation: