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faust18 [17]
3 years ago
13

F(x)=-x2+8x-1 find f(3) show work

Mathematics
1 answer:
r-ruslan [8.4K]3 years ago
6 0
F(3)= -(3)^2+8(3)-1
=14
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If an electric kettle uses
cupoosta [38]

Answer:

The energy used in 3.5 hours = 5.25 kilowatts            

Step-by-step explanation:

Energy used by electric kettle:  

  • 2\frac{1}{4}=\frac{9}{4}=2.25 kilowatts

Time taken by electric kettle:

  • 1.5 hours

Electric kettle's rate in kilowatts per hour can be calculated by dividing the spent energy i.e. 2.25 kilowatts by the time taken i.e. 1.5 hours.

Therefore,

Electric kettle's rate = 2.25 kilowatts / 1.5 hour

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Thus, the energy used in 3.5 hours = 1.5 × 3.5

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Therefore, the energy used in 3.5 hours = 5.25 kilowatts                        

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3 years ago
Is 87656432 divisible by 4? Is there a shortcut?
Natasha2012 [34]
Hope this isn't too confusing

All of the numbers have different shortcuts.
1. Yes. Divisible by 4: if last two digits are divisible by 4 then the whole number is yes)
2. No. Divisible by 6: it must be even and when you add them up, (44) it must be divisible by 3 (no, 44 is not divisible by 3)
3. Divisible by 8: ( last 3 numbers are divisible by 8 (312) = 39 ( yes it is)
4 Yes. Divisible by 11: ( sum of digits at odd places and sum of digits at even spaces,is either 0 or divisible by 11) yes, 278949. (2+8+9) + (7+9+9)= 19 + 25 = 44 and 44 is divisible by 11)
5. No. Divisible by 12 (divisible by 3 and 4, sum of digits is divisible by 3 ; and last 2 digits divisible by 4: 87654395 : 52/3= 18 (yes) 95/4(no) this number not divisible by 12
6. No. Divisible by 15: divisible by 3 and 5 ..87654385 = 46/3 = 15..(No) divisible by 5 yes. The number is not divisible by 15

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3 years ago
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kvv77 [185]
140 sandwiches sold :)
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3 years ago
How do I graph this or how do I get a equation I can graph?​
Helga [31]

Answer:

y=mx+b

Step-by-step explanation:

7 0
3 years ago
The new number, 550, is 200 more than the original number. What is the approximate percent change?a The percent change is 33%. b
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B The percentage change is 55%
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3 years ago
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