Answer:
2
Step-by-step explanation:
3/4 + 5/6 (lowest common denominator = 12)
= 9/12 + 10/12
= 19/12
19/12 ÷ 2/3 (reciprocate 2/3 to replace division sign by multiplication sign)
= 19/12 x 3/2
= 57/24
= 19/8
= 2
Hope this helps :)
9
In a equilateral triangle all angles are equal and 60° each so
7x - 3 = 60° ➡ 7x = 63° ➡ x = 9
Grade≥69(at least 69)
(77+69+65+x)/4=70
x=69
so he must get 69 or more
![A = A_{0}*( \frac{1}{2})^(t/t_{\frac{1}{2}) [tex]A= Amount of Substance Left A_{0} = Initial Amount of Substance t = Time Taken t_{\frac{1}{2}} = Half-Life of the Substance](https://tex.z-dn.net/?f=A%20%3D%20A_%7B0%7D%2A%28%20%5Cfrac%7B1%7D%7B2%7D%29%5E%28t%2Ft_%7B%5Cfrac%7B1%7D%7B2%7D%29%20%20%5Btex%5DA%3D%20Amount%20of%20Substance%20Left%20A_%7B0%7D%20%3D%20Initial%20Amount%20of%20Substance%20t%20%3D%20Time%20Taken%20t_%7B%5Cfrac%7B1%7D%7B2%7D%7D%20%3D%20Half-Life%20of%20the%20Substance)
