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Lana71 [14]
2 years ago
6

Suppose that the water level of a river is 32 feet and that it is receding at a rate of 4 feet per day. Write an equation for th

e water level, y.
after x days. In how many days will the water level be 16 feet?

Select the correct equation and solution (You should pick two answers).

A) y = 4.0 + 32
B) y= -4x +32
C) 4 days
D) 8 days
Mathematics
2 answers:
ZanzabumX [31]2 years ago
5 0

Answer:

a and 4

Step-by-step explanation:

marin [14]2 years ago
3 0
A is the right answer
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What is the square root of -1
Zinaida [17]

Answer:

i

Step-by-step explanation:

square root of -1 is i

6 0
3 years ago
Read 2 more answers
Given a function <img src="https://tex.z-dn.net/?f=f%28x%29%3D3x%5E4-5x%5E2%2B2x-3" id="TexFormula1" title="f(x)=3x^4-5x^2+2x-3"
Levart [38]

Answer:

\huge\boxed{f(-1) = -7}

Step-by-step explanation:

In order to solve for this function, we need to substitute in our value of x inside to find f(x). Since we are trying to evalue f(-1), we will substitute -1 in as x to our equation.

f(-1) = 3(-1)^4 - 5(-1)^2 + 2(-1) - 3

Now we can solve for the function by multiplying/subtracting/adding our known values.

Starting with the first term to the last term:

  • 3(-1)^4 = 3

<u><em>WAIT</em></u><em>!</em><em> How is this possible? </em>-1^4 = -1 (according to my calculator), and 3 \cdot -1 = -3, not 3!

It's important to note that taking a power of a negative number and multiplying a negative number are two different things. Let's use -2^2 as an example.

What your calculator did was follow BEMDAS since it wasn't explicitly told not to.

BEMDAS:

- Brackets

- Exponents

- Multiplication/Division

- Addition/Subtraction

Examining the equation, your calculator used this rule properly. Note that exponents come over multiplication.

So rather than  being <em>"-2 squared"</em> - it's <em>"the negative of of 2 squared."</em>

Tying this back into our problem, the squared method would only be true if it looks like -1^4. However, since we're substituting in -1, it looks like (-1)^4, so the expression reads out as "<u><em>-1 to the fourth.</em></u>"

MULTIPLYING -1 by itself 4 times results in -1\cdot-1\cdot-1\cdot-1=1.

Applying this logic to our original term, 3(-1)^4:

  • 3(-1\cdot-1\cdot-1\cdot-1)
  • 3(1)
  • 3

Therefore, our first term is 3.

Let's move on to our second and third terms.

Second term: -5x^2

  • -5(-1)^2

Applying the same logic from our first term:

  • -5(-1 \cdot -1)
  • -5(1)
  • -5

Third term: 2x

  • 2(-1) = -2

-3 is just -3, no influence of x.

Combining our terms, we have 3-5-2-3.

This comes out to be -7, hence, the value of f(-1) for our function f(x)=3x^4-5x^2+2x-3 is <u>-7</u>.

Hope this helped!

4 0
3 years ago
Read 2 more answers
Pls help me guys! This is super hard
zheka24 [161]
This explanation shall help you, To find a mean you first need to add
25 + 21+36+16+32 and then divide by 5  and then you will get your answer. Hope this helps!
4 0
3 years ago
Read 2 more answers
I need help with f &amp; h I need to see the steps to get the answer, not just the answer.
klemol [59]
24÷1000= 3/125 =0.024(f)
6 0
3 years ago
which of the following is the best definition of “social justice”? the idea that the law is sacred and always applies to everyon
gulaghasi [49]
Social justice can be defined as the idea that the law is sacred and always applies to everyone in the exact way.
7 0
3 years ago
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