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ruslelena [56]
3 years ago
9

The function f is defined by f(x)=-x2+2x-7. What is the value of f(-3)?

Mathematics
1 answer:
Helen [10]3 years ago
6 0

Answer:

Option A f(-3)=-22

Step-by-step explanation:

we have

f(x)=-x^{2}+2x-7

we know that

f(-3) is the value of f(x) when the value of x is equal to -3

so

For x=-3

substitute the value of x=-3 in the equation

f(-3)=-(-3)^{2}+2(-3)-7

f(-3)=-9-6-7

f(-3)=-22

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The speed of sound in air on a certain stormy day is about 1130 feet per second. You see a flash of lightning striking some dist
Elina [12.6K]

Answer:

distance = 1.5 miles(approx.)

Step-by-step explanation:

given,

speed of sound = 1130 ft/s        

1 ft = 0.3048            

1130 ft/s = 0.3048 × 1130 m/s      

              = 344.424 m/s          

time = 7 second                

distance = speed × time                

distance = 344.424 × 7              

distance = 2410.968 m                    

1 m = 0.0006214 miles                    

2410.968 m =  (0.0006214 ×  2410.968) miles    

distance = 1.498 miles                        

distance = 1.5 miles(approx.)

6 0
3 years ago
⦁ Find the distance between the two numbers
Temka [501]
1. 12+19=31
2. -14
3.0
8 0
3 years ago
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kaitlin is on a long car trip every time she stops she loses 15 minutes of travel time is she stops 5 times how late will she be
yanalaym [24]
5(15)= 75 minutes or an hour and 15 minutes lost
8 0
4 years ago
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In creating the shooter-style game comparable to Space Invaders, we decided that each time the laser hits an object, the player
olya-2409 [2.1K]

Answer:

Outcome

Step-by-step explanation:

I'm not exactly certain but I believe the answer is outcome. For example: Each time the laser hits an object, the player gets a point. Because you're giving the cause, the laser hitting the object, and the effect, the player getting a point;its safe to assume that the element is outcome.

3 0
3 years ago
Shiny White dental insurance costs $258 per year. Approximately one-third of insured people need a filling, which averages $110
sveta [45]

Answer:

  about $145.33

Step-by-step explanation:

Consider a group of 15 customers. They will pay ...

  15 × $258 = $3870

in premiums each year.

One-third of those, 5 customers, will submit claims for fillings, so will cost the insurance company ...

  5 × $110 = $550

And 80% of them, 12 customers, will submit claims for preventive check-ups, so will cost the company ...

  12 × $95 = $1140

The net income from these 15 customers will be ...

  $3870 -550 -1140 = $2180

Then the average income per customer is this value divided by the 15 customers in the group:

  $2180/15 = $145.33

_____

<em>Alternate solution</em>

Above, we chose a number of customers that made 1/3 of them and 4/5 of them be whole numbers. You can also work with one premium and the probability of a claim:

  258 - (1/3)·110 - 0.80·95 = 145.33

8 0
3 years ago
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