Answer:
B
Step-by-step explanation:
Since a function would mean that a customer is able to purchase 1.1 of an item or 1.5 of an item, which is false. It also means that the customers pay the same price for a different amount of items.
Answer:
x = 14
Step-by-step explanation:
∠ NQM and ∠ PQR are congruent ( indicated by the same orange arc within the 2 angles ) , then
2x + 8 = x + 22 ( subtract x from both sides )
x + 8 = 22 ( subtract 8 from both sides )
x = 14
Answer:
C) 7/2 minutes per lap
Step-by-step explanation:
7 laps/ 2minutes. To find how many minutes it takes Beth to swim one lap, which is her in minutes per lap, you have to divide 7/2 to get 3.5 min/1 lap, or 7/2 min/1 lap.
Answer:
The cost of chair is
The cost of a lamp is
The cost of a table is
Step-by-step explanation:
Let
x----> the cost of chair
y----> the cost of lamp
z----> the cost of table
we know that
----> equation A
-----> -----> equation B
------> equation C
substitute equation C and equation B in equation A and solve for x
Find the value of y
Find the value of z
therefore
The cost of chair is
The cost of a lamp is
The cost of a table is
Answer:
9 hours
Step-by-step explanation:
According to Newton's laws of cooling
dT/dt = -k(T - A)
Let U = T - A
dU/dT = 1
dU = dT
dt/dt = -kU
dT = -kU(dt)
dU/U = -kdt
On integration
ln(U) = -kt + C
U = Ce^-kt
T - A = Ce^-kt
T(0) = 68
T(5) = 25
68 - 20 = Ce^-k(0)
C = 48
and
25 -20 = 48e^-k(5)
5 = 48e^-5k
e^-5k = 5/48
-5k = ln (5/48)
k = - ln(5/48) / 5
k = - 0.4524
T - 20 = 48e^-0.4524t
When T = 21
21 -20 = 48e^-0.4524t
1 = 48e^-0..4524t
e^-0.4524t = 1/48
-0.4524t = ln (1/48)
t = - ln(1/48) / 0.4524
t = 8.5570
t= 9 hours ( to the nearest hour)