Hello :
f'(x) = 5/x²
<span>the derivative of f(x) = -5/x at x = 11.is : f'(11) = 5/11² = 5/121</span>
Answer:
D
Step-by-step explanation:
3.50/5 = .70
.70x7 = 4.90
so 7 cakes cost 4.90 pounds.
1000 milliliters are in a liter.
Answer:
The solution of the system is (5, 20).
Step-by-step explanation:
y = 4x and 3x + 2y = 55 are simultaneous equations. To find the unknowns, we have to solve these equations simultaneously.
The first can be rewritten as
4x – y = 0.
Therefore, we have:
4x – y = 0
3x + 2y = 55
Multiplying the first equation by 2 all through, we have
8x – 2y = 0.
So we can now combine the second equation with the first multiplied by 2.
8x – 2y = 0
3x + 2y = 55
Adding these equations we have:
11x = 55
Divide both sides by 11 and we have
x = 5
Substitute x = 5 in equation 1, we have
4(5) – y = 0
y = 20.
Therefore, x = 5 and y = 20.
The solution of the system is (5, 20).
