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3 years ago

2x+3y evaluate the expression when x=2 and y=-3

Mathematics

1 answer:

ELEN [110]3 years ago

3 0

Answer:

2(2)+3(-3)=

4-9=

-5

Step-by-step explanation:

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Help with functions right quick? :) please

-Dominant- [34]

The answer is: [B]: -4 .
_____________________________
Here is the problem:
_____________________
"Find f(3)."
_______________________
f(x) = $\left \{ {x + 5 ; if x \ \textless \ -2 ; \atop {-4; if x \geq -2 ;}} \right.$ ;
______________________________________
Since we are asked to find: " f(3)" ; we consider the number, "3", which is GREATER THAN OR EQUAL TO "-2" ; (that is, " 3 $\geq$ -2" ;
and f(x) = -4 if x $\geq$ -2 .
_____________________________________________________
So, in this case, f(x) = f(3) = -4 ; which is: "Answer choice: [B] ".
_____________________________________________________

6 0

4 years ago

What are the coordinates of the vertex f(x)=2(x+1)(x+3)

artcher [175]

Answer:

$(-2,-2)$

Step-by-step explanation:

There are many methods to find the vertex of a quadratic function. The method that I will show you is by using the roots of the function

In the case of this function, the roots are $x=-1, x=-3$ ..

The vertex of a function will always be directly between these roots. The number that is directly between -1 and -3 is -2. This means that the x-value of our vertex is -2.

Now that we have the x-value, we can plug this into the function in order to get our y-value.

$2(x+1)(x+3)\\\\2(-2+1)(-2+3)\\\\2(-1)(1)\\\\-2$

We have found that our y-value is -2. This means that the coordinates of the vertex are $(-2,-2)$

4 0

4 years ago

A 1000 gallon tank, initially full of water, develops a leak at the bottom. Given that 300 gallons of water leak out in the firs

Over [174]

Answer:

option F

Step-by-step explanation:

given,

capacity of tank = 1000 gallon

volume of water leak = 300 gallon

time = 30 min

water is leaking at the rate

formula used

$A = B e^{-kt}$

At t = 0 A = 1000 gallons

$1000= B e^{-k\times 0}$

B = 1000

$A = 1000 e^{-kt}$

at t = 30 A = 700

$700= 1000 e^{-k\times 30}$

$e^{-k\times 30}=0.7$

taking ln both side

$-k\times 30=ln(0.7)$

$k=-\dfrac{ln(0.7)}{30}$

now,

$A = 1000 e^{\dfrac{ln(0.7)}{30}t}$

$A = 1000\times 0.7 e^{\dfrac{t}{30}}$

$A = 700 e^{\dfrac{t}{30}}$

hence, the correct answer is option F

6 0

4 years ago

What is 3 root of 343 ?

ladessa [460]

3 0

3 years ago

Read 2 more answers

You roll a six-sided die twice. What is the probability of rolling an even number and then an odd number?

nlexa [21]

Answer:

C) 1/4

Step-by-step explanation:

Because you have six-sided dice there are 3 odd numbers and 3 even numbers. That means you have a 1/2 for getting either a odd or even number. So we would add 1/2 + 1/2 because you are rolling two times and both have a 1/2 of getting either a odd or even number. 1/2+1/2 = 1./4 which would be your answer.

Hope this helped! Have a good day/night and good luck! Stay safe!!

6 0

4 years ago