Answer:
Option B, z = 2
Step-by-step explanation:
<u>Step 1: Factor</u>
z^2 - 4z + 4 = 0
<em>(z - 2)(z - 2) = 0</em>
<em />
<u>Step 2: Solve for z</u>
z - 2 + 2 = 0 + 2 and z - 2 + 2 = 0 + 2
z = 2 and z = 2
<em>Double root at z = 2</em>
<em />
Answer: Option B, z = 2
I believe the answer to this diagram should be <u><em>Diagram B</em></u>
Answer:
Step-by-step explanation:
???444489485857586868........................
Answer:
61°C
Step-by-step explanation:
Newton's Law of cooling gives the temperature -time relationship has:
T (t) = 20 + 75 е⁻(t/50)-------------------------------------------------------- (1)
where Time is in minutes (min) & Temperature in degree Celsius (°C)
During the first half hour, t = 30 mins
Substituting into (1)
T = 20 + 75 е⁻(30/50)
= 20 + 75(0.5488)
= 20 + 41.16
= 61.16°C
≈ 61°C