The equivalent expressions are ~
<h3>Question : 1 </h3>
<h3>Question : 2</h3>
<h3>Question : 3 </h3>
Answer:
A=7
Step-by-step explanation:
A=1/2h(b1+b2)
plug in what you know
A=1/2x2(3+4)
PEMDAS
A=1/2x2(7)
A=1/2x14
A=7
The amount of sugar 
in the starting solution contributes to a 36% concentration, so we have
units of sugar in the solution.
Into this solution, Sharon wants to pour 
liters of water to obtain a smaller concentration of sugar in the overall solution:
So Sharon needs to add 
liters of water to the solution to get the desired concentration.
There are 4 positions in the string that each have 25 choices (any letter in the English alphabet except A) and the other positions are filled with A, so there are 25⁴ possible strings containing exactly 7 A's.
Overall, there are 26¹¹ possible strings of length 11.
Then the probability of randomly generating a string containing exactly 7 A's is
25⁴ / 26¹¹ ≈ 0.000000000106427
