$60 because 1/5 is 20 so 3/5 is 60
Let x be the score of the 3rd quiz,, then the average score will be:
(83+91+x)/3, which = (174+x)/3. but this average should be greater or equal to 85 and smaller or equal to 90:
85 ≤ (174+x)/3 ≤ 90
1st multiply all terms with 3 → 255 ≤(174+x) ≤ 270
2nd subtract 173 from all terms → 255-174 ≤174-174+x ≤270-174
81 ≤ x ≤ 96
Answer:
Area of the trapezoid = 36√6 cm²
Step-by-step explanation:
Area of the trapezoid = height ( base1+ base2/2)
height = √36
base1= 3√6
base 2= 3√54
Putting the values in the formula
Area of the trapezoid = height ( base1+ base2/2)
= √36 ( 3√6+3√54/2)
= 6 ( 3√6+3√6*9/2) Factoring
= 6 ( 3√6+3*3√6/2) Multiplying
= 6 ( 3√6+9√6/2) adding
= 6 ( 12√6/2)
= 6 ( 6√6)
= 36√6 cm²
I think it would be y plus 3 times 2 equals 5x. I'm not sure if that is what they are asking for.