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densk [106]
3 years ago
14

Joseph drove for 3 hours at the speed of 40 km/h (kilometers

Mathematics
1 answer:
bezimeni [28]3 years ago
7 0

Answer:

250 km.

Step-by-step explanation:

Alright, so for this problem we can split it into two parts. Since distance = speed*time, the first 3 hours give us 3*40 or 120 km, and the last 2 hours give us 2*65, or 130 km. Adding these together, we get a final distance of 250 km.

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A(-6,9) B(12,9) C(-6,-12)
8 0
3 years ago
a psychologist contends that the number of facts of a certain type that are remembered after t hours is given by the following f
laiz [17]

Answer:

At t=1, Rate of Change=-36.86

At t=10 hours, Rate of Change =-0.0088

Step-by-step explanation:

The function which describes the number of facts of a certain type which are remembered after t hours is given as:

f(t)=\frac{85t}{99t-85}

To determine the Rate of Change at the given time, we first look for the derivative of f(t).

Applying quotient rule:

f^{'}(t)=\frac{-7225}{{\left( 85 - 99\,t\right) }^{2}}

At t=1

f^{'}(1)=\frac{-7225}{(85-99)^{2}}

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At t=10 hours

f^{'}(10)=\frac{-7225}{(85-99(10))^{2}}

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4 0
4 years ago
Are these functions?
likoan [24]

Answer:

Relation 1: No

Relation 2: Yes

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6 0
4 years ago
I'm unsure on how to do 8,9, and 11.
Irina-Kira [14]
X^2 - 16x + 56 = 0

= (x - 8)^2 - 64 +56= 0
= (x - 8)^2 - 8 = 0

x^2 - 8x + 11 = 0
(x - 4)^2 - 16 + 11
(x - 4)^2 - 5 = 0

(x + 15)(x + 5) = 96

x^2 + 20x + 75 = 96

(x + 10)^2  - 100 + 75 = 96
(x + 10)^2 = 96 +25 =   121
taking square roots:-

x + 10  = 11
x = 1


8 0
3 years ago
The y-intercept of 2x-y=6 is -6
worty [1.4K]
Yes it is. y=2x-6 so y intercept is (0,-6)
7 0
3 years ago
Read 2 more answers
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