Answer:
53 marks
Step-by-step explanation:
To sue a linear equation to solve the given problem, we must assign a function to the score of one of them. Let the score of Azmah be N. Then given that Azmah scored 17 marks more than Yazid, Yazid's score will be 
= N - 17
Given that Suzana's score is twice of Yazid's score, then Suzana's score
= 2(N - 17)
If their total score is 161 then
N + N - 17 + 2(N - 17) = 161
4N = 161 + 51
4N = 212
N = 53 . This is Azmah's score
 
        
             
        
        
        
Answer:
ñ = -1
Step-by-step explanation:
 
        
             
        
        
        
Use the formula S=P-PD
S is sale price, original price is P, and PD is discounted percent,
276.25=P-P(.65), I turned the percent into a decimal.
276.25=P(1-.65)
276.25=P(1-.65)
276.25=P(.35)
Now cross multiply.

Hope this helps, now you know the answer and how to do it. Stay healthy and safe and HAVE A BLESSED AND WONDERFUL DAY! :-)  
- Cutiepatutie ☺❀❤
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Amount of brine = 100 gal 
amount of salt = 80 lb 
rate of water running = 4 gal / min 
Let A be the amount of salt in lb in the tank at any time t. 
(a) dA/dt = rate of salt in - rate of salt out 
Rate of salt in = 0 
rate of salt out = A x 4 / 100 = A / 25 lb/min 
So, dA/dt = 0 - A/25 = - A/25 lb/min 



When t = 0, A = 80 lb 
So,
 
(b) Now, A = 40 lb 
So, 


take log on both the sides 

t = 17.3 minutes