Her average is calculated by the mean, which takes the sum of all her scores and divides it by the number of steps.
Therefore, we just need to set up an inequality using the above formula. I'll call the third test 'x'.
First add all test scores together, divide by 3 and then use ‘>’ to show the left side must be greater than 80:
(70 + 80 + x)/3 > 80
Next, simplify everything. 70 + 80 can be simplified to 150:
(150 + x)/3 > 80
Then multiply both sides by 3. The 3 on the left side cancels out as divide 3 and multiply 3 equals zero:
(150 + x) * 3 > 80 * 3
Now simplify everything again:
150 + x > 240
Now subtract 150 from both sides to isolate the x. 150 - 150 cancels out to zero:
150 + x - 150 > 240 - 150
Now simplify again and you have your answer:
x > 90
From rearranging the inequality, we have found that in her third test (x), she must score above 90 to have an average greater than 80.
Answer:
388 or 288
Step-by-step explanation:
this week in total = 100
4 more ( + ) 3 times ( x ) last
- - - - - -
100 - 4 = 96
96 x 3 = 288
either subtract or add
288 - 100 = 188
or add
288 + 100 = 388
hope this helps !
it may right or wrong :)
Answer:
Width= 12 yards
Length= 24 yards
Step-by-step explanation:
Perimeter of a rectangle= 2(length + width)
Let
w= width
Twice as long as it is wide
Length= 2w
Perimeter of the rectangle= 72 yards
Perimeter of a rectangle= 2(length + width)
72 = 2(2w + w)
72 = 4w + 2w
72 = 6w
Divide both sides by 6
72/6 = w
12= w
w=12
Therefore,
Width= 12 yards
Length= 2w
=2(12)
=24 yards
90 is the nearest 10. You round up at 5 and above, you round down from 1 to 4.
All you have to do is find the square root of 144. 12 times 12 is 144.
