Question

Help me please? Am I right?

Answer 1

I'm not getting the same answer

The notation \[\LARGE \lceil x\rceil \] means "ceiling". Basically whatever the input is, we round up to the nearest whole number
examples:
\[\LARGE \lceil 1.2\rceil = 2 \]
\[\LARGE \lceil 2.7\rceil = 3 \]
\[\LARGE \lceil 5.00001\rceil = 6 \]
does this help?

Answer 2

yeah D?

Answer 3

oh wow i didnt know it was called ceiling so how do I enter that on a calculator?

Answer 4

what kind of calculator do you have?

Answer 5

I just use google, but i tried adding it up for that problem and im at around 3.. the closest would be D is that correct?

Answer 6

yes I'm getting D as well. Nice job

As for a calculator that supports the "ceiling function", geogebra is one that can. Other programs may be able to as well

Answer 7

oh ok :) can you help me with 2 more? I'm not really getting these...

Answer 8

ceil(x) means "ceiling function of x"


f(x) = 0.42 + 0.20*ceil(x-1)
f(2.9) = 0.42 + 0.20*ceil(2.9-1)
f(2.9) = 0.42 + 0.20*ceil(1.9)
f(2.9) = 0.42 + 0.20*2 ... rounding UP to the nearest whole number
f(2.9) = 0.82


f(x) = 0.42 + 0.20*ceil(x-1)
f(4.1) = 0.42 + 0.20*ceil(4.1-1)
f(4.1) = 0.42 + 0.20*ceil(3.1)
f(4.1) = 0.42 + 0.20*4 ... rounding UP to the nearest whole number
f(4.1) = 1.22


f(2.9) + f(4.1) = 0.82 + 1.22 = 2.04

so that confirms it is D) 2.04

Answer 9

oh ok so it really is basically the ceiling

Answer 10

yeah think of it as a vertical number line. If you're in between two whole numbers, then you want to move up to the nearest whole number

Answer 11

\[\LARGE \lceil 3.2\rceil = 4\]
\[\LARGE \lceil 2.9\rceil = 3\]
so the two aren't equal

Answer 12

C?

Answer 13

what is \(\Large \lceil 4.8 \rceil\) going to be equal to?

Answer 14

5

Answer 15

you are correct

sorry I misread choice D, let me try again lol

what is \(\Large \lfloor 4.8 \rfloor\) equal to?

Answer 16

5

Answer 17

notice how the bars are going the other way

Answer 18

\[\Large \lfloor 4.8 \rfloor = 4\] because we round down

\[\Large \lfloor x \rfloor = \text{round down to the nearest whole number}\]
\[\Large \lceil x \rceil = \text{round up to the nearest whole number}\]

Answer 19

so it isnt D then?

Answer 20

\[\Large \lfloor 4.8 \rfloor = 4\]
\[\Large \lceil 3.2 \rceil = 4\]

so the two are equal. It definitely is D

Answer 21

it might help to draw a vertical number line with whole numbers on it

Answer 22

oh ok thanks :) what about this one

Answer 23

plot 4.8 on the number line



it's somewhere between 4 and 5 (closer to 5)

Answer 24

the ceiling function tells us to go UP to the nearest whole number



so we bump up to 5