I'm not a 100% but i think it's <
The first one is D because you would divide for amount each day, and the second one is A because that has the correct expression of division.
The kilogram of grass eaten by the cow is 7kg and the kilogram of grass eaten by the horse is 6kg.
<h3>The two simultaneous equations that can be derived from the question:</h3>
9h + 45c = 369 equation 1
4h = 3c + 3
4h - 3c = 3 equation 2
Where:
c = kg eaten by cows
h = kg eaten by horses
<h3>What is the value of h?</h3>
In order to determine the value of h, multiply equation 2 by 15
60h - 45c = 45 equation 3
Subtract equation 3 from equation 1
69h = 414
h = 6kg
<h3>
What is the value of c?</h3>
Substitute for c in equation 2
4(6) - 3c = 3
24 - 3c = 3
21 = 3c
c = 7
To learn more about simultaneous equations, please check: brainly.com/question/25875552
Answer:
200$
Step-by-step explanation:
In this case, we already know the ratio between the savings and the spendings and it's 3:5.
This means that for every 3$ saved, Sam spents 5$.
Then, we only need to do a simply rule of 3, to stablish the amount spended.
If:
120 ---------> 3
X ------------> 5
Solving for X, we have:
120/X = 3/5
X = 120 * 5 / 3
X = 600 / 3
X = 200$
If you want to verify that this calculation is correct, then do the ratio between 120 and 200. If the ratio is 3:5 is correct. Here's the demostration:
120/200 --->simplified by 10: 12/20 ------->simplified by 4: 3/5
Answer:
Conjecture : 2xy / ( x + y ) ≤ √xy
Step-by-step explanation:
Harmonic mean of x and y = 2xy/( x + y )
<u>Formulate a conjecture about their relative sizes </u>
we will achieve this by computing harmonic and geometric means
Geometric mean = √xy
harmonic mean = 2xy/( x + y )
Conjecture : 2xy / ( x + y ) ≤ √xy
attached below is the proof