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erica [24]
3 years ago
10

If x = -4, calculate 2x squared - 5

Mathematics
1 answer:
Varvara68 [4.7K]3 years ago
5 0
You just substitute the value of x in the given equation:


f(x) = 2x^2 - 5

f(-4) = 2 (-4)^2 -5 = 27

f(x) : a name given to the equation
f(-4): refer to the equation when the value of the independent variable x has the value between the brackets.
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There is 75 gallons of water into the pool every hour if the pool can hold 6,750 gallons how long will it take to fill the pool?
Andreyy89

Answer:

90 hours

Step-by-step explanation:

The rate at which water enters the pool is

 75 gallons

-------------------

       1 hour

This is equivalent to

         1 hour per 75 gallons, leading to:

        1 hour

  -------------------- * 6,750 gallons   =   90 hours

      75 gallons

3 0
3 years ago
Marion Pelk worked 9 days in two weeks. He worked each day and was paid $7.1 an hour. What gross pay he earn for the two weeks?
Andrews [41]

Answer:

$1533.60 !

Step-by-step explanation:

$7.10 per hour needs to be times by 24 (to calculate the pay per day) = $170.40 then times that by 9 = $1533.60 (The pay for 9 days which is coincidently the pay per 2 weeks!

Job done! The answer is $1533.60!

[If I am wrong please message me and tell me]

5 0
3 years ago
Explain how the number of pieces in a whole relates to the size of each piece?
Bumek [7]
Assuming the size of the whole remains constant, as you divide the whole into more pieces, each piece must be smaller. For example, when a whole is divided into four pieces vs nine pieces, 1/4 of the whole is larger than 1/9 of a whole.
4 0
3 years ago
What is the slope of the line in the graph? slope= pls help!!!!!!!!!!!!!!
Flauer [41]

<u>Answer:</u>

1

you rise 1

then run to the right 1

1/1 = 1

let me know if you need a more in-depth explanation.

4 0
3 years ago
Micheal solved this inequality as shown: step 1: -6(x + 3) + 10 &lt; -2 step 2: -6x - 18 + 10 &lt; -2 step 3: -6x - 8 &lt; -2 st
Anastaziya [24]
<h3>Answer:   addition property of inequality</h3>

================================================

Explanation:

These are the steps to focus on

step 3: -6x - 8 < -2

step 4: -6x < 6

The move from the third step to the fourth step has us adding 8 to both sides. Therefore, we use the addition property of inequality.

That property has four forms

  1. If a > b then a + c > b+c
  2. If a < b then a+c < b+c
  3. If a \ge b then a + c \ge b+c
  4. If a \le b then a+c \le b+c

It's similar to the idea of starting with a = b, then adding c to both sides to get a+c = b+c

We add the same thing to both sides to keep things balanced.

8 0
2 years ago
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