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netineya [11]
3 years ago
14

Evaluate the function... I'm stuck on this question

Mathematics
1 answer:
hodyreva [135]3 years ago
3 0

Answer:

f(-1) = 3

Step-by-step explanation:

f(x) = -x^{2} - 4x

at x=-1

f(-1) = -(-1)^{2} - 4(-1)

f(-1) = -1 + 4

f(-1) = 3

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2500 + 20%=what's the answer
zysi [14]

Answer:

  as written: 2500.2

  as intended: 3000

Step-by-step explanation:

20% = 0.2, so adding 0.2 to 2500 gives 2500.2

_____

We suspect you want to add 20% of 2500 to 2500. That is ...

  2500 + 20%×2500

  = 2500 + 0.20×2500

  = 2500 + 500

  = 3000

_____

<em>Comment on percentages</em>

A percentage is a pure number. It is a ratio of like quantities, so has no units.* A <em>useful</em> percentage always has a base. That is, it is a percentage <em>of something</em>. Sometimes that base may be unclear or unstated, in which case the percentage might very well be considered to be meaningless.

In any event, a percentage is simply a (unitless) fraction. The "%" symbol means the same thing as "/100", so 20% means 20/100 = 2/10 = 1/5.

The very clear math expression 2500 +20% means simply 2500 + 1/5, which is the mixed number 2500 1/5 or the decimal value 2500.2. Usually, when we want to add a percentage to some value, we want the percentage to be <em>of the original value</em>. When that is written as a math expression, it must show this:

  2500 + 20% of 2500

  2500 + 20%×2500

  2500(1 +20%)

_____

* The concentration or potency of some medicines or other mixtures may be expressed as a percentage that is the ratio of one unit to a different unit, typically weight per volume. That is, a "0.1%" preparation may be 0.1 grams per 100 mL, for example. You have to read the label to determine whether this is the case. Mathematically, this is not a percentage, but is a non-standard use of the "%" symbol to indicate a ratio to 100 of something.

4 0
3 years ago
Consider the following system of equations given in slope-intercept form. y=-3x+17 y = 5x - 23 Use the graphing calculator to de
Slav-nsk [51]

Answer:

Consider the following system of equations given in slope-intercept form.

y = −1

3

x + 17,

y = 5x - 23

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Ronnie brought a 25pound bag of food kills dog 810 2/5 lb of food in the first month and 10 or 5 pound of food and the second on
ch4aika [34]
What is the question here?
4 0
3 years ago
What percent id 25 of 100?
Cloud [144]
25/100 is equal to 25%.

Percents are always out of 100.
So 25/100 is 25%.

Hope this helped☺☺
6 0
3 years ago
Solve the inequality.
mr Goodwill [35]

Answer:

the first one, v < 1 23/25

Step-by-step explanation:

multiply both sides by 6 and divide by 5

v < 48/25, or v < 1 23/25

5 0
3 years ago
Read 2 more answers
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