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larisa [96]
3 years ago
5

Evaluate the expression for x = –3. x^2+4x+3

Mathematics
1 answer:
DanielleElmas [232]3 years ago
7 0

Answer:

0

Step-by-step explanation:

Substitute x = - 3 into the expression

x² + 4x + 3

= (- 3)² + 4(- 3) + 3

= 9 - 12 + 3

= 0

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Write a direct variation equation that relates x-miles and y- kilometers.
svet-max [94.6K]

Answer:

y=1.60934x

Step-by-step explanation:

If x is directly proportional to y, then

y\propto x

y=kx

where, k is constant of proportionality.

We know that,

1 miles = 1.60934 km

It is given that x-miles and y- kilometers. Constant of proportionality is 1.60934.

y=1.60934x

Hence, the required equation is y=1.60934x.

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4 years ago
Please help ASAP. Need it for homework
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How are piecewise functions and infinite limits alike? How are they different?
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What is the inverse of the function f(x) = 2x - 10?
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4 years ago
If dy/dt=-10e^-t/2 and y(0)=20 what is the value of y(6)​
stiv31 [10]

ANSWER

y (6)=  \frac{20}{ {e}^{3} }

EXPLANATION

The given equation is:

\frac{dy}{dt}  =  - 10 {e}^{ -  \frac{t}{2} }

We integrate with respect to t to get,

y = 20 {e}^{ -  \frac{t}{2} }  + k

The initial condition is y(0)=20

We apply the initial condition to get,

20= 20 {e}^{ -  \frac{0}{2} }  + k

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This implies that;

y = 20 {e}^{ -  \frac{t}{2} }

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Or

y (6)=  \frac{20}{ {e}^{3} }

3 0
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