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What do the plus and minus numbers mean on eye prescriptions? I have a minus 2 number in one eye and minus 2.5 in the other and I have no idea what that means.

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Basically the numbers are an indication of your vision level. Minus numbers refer to being nearsighted (also known as short sighted). Plus numbers are far sighted (also known as long sighted).

So if you have a minus number it means that you have trouble seeing things in the distance but can probably see things that are close to you without any problems.

Posted on Feb 13, 2013

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Hai again your support helps me alot can you please differentiate for me between the following -6to the power 2 and -6 to the power 2,& 2 to the power -3 + 1/3 to the power-2


Fixya maths 4 indices

Indices n surds

Hai again your support helps me alot can you please differentiate for me between the following -6to the power 2 and -6 to the power 2,& 2 to the power -3 + 1/3 to the power-2
I need a clarity how to convert these exponents to fractions
Posted by Ncwana Noziphiwo on Apr 03, 2018

https://www.tes.com/teaching-resource/indices-negative-indices-6427219

-62 means a number multiplied by itself twice
So in this case it is -6 x -6 = 36 - since -x- = +
If this was -6-2 the negative power means it's a fractional indice so first make it look like a fraction
1/-62 now it looks like a fraction (inverse) and the power mow looks like a normal square
Coz its still a negative number -6 x -6 = 36
So the answer is now 1/36

So when it is a minus power, first turn it into a fraction, then calculate as normal
Note: every number has a sign, it is either + or minus.
By convention, we always assume it is a plus unless stated otherwise.
To make sure u remember this fact put a plus sign in front of every number if no sign is showing
You can start with buses the 27 bus is +27
Its like if u say u have a car, what u really mean is you have 1 car. But u drop the 1 coz everyone takes for granted u meant 1 car, 1 house, 1 friend etc
Every power we assume its + unless otherwise stated.
So when a minus is put in front of the power, its saying make it a fraction first!
Maths is a game and games have rules.
This rule is a minus in front of power (indice) change to fraction form first!
So if it is 2-3 - the power -3 is saying turn it into a fraction first so
1/23 = 1/ 2x2x2 = 1/8
If it had of been 23 notice how no signs shown because we take for granted they r all +
Let's show them
+2+3 since it's a plus 3 we don't need to change it to a fraction and since it is a plus 2
We have +2 x + 2 x +2 and a +x+ x+ = +
2x2x2 = 8
Its easier to just do 23 = multiply the 2 by itself 3 times
2x2x2 = 8
When doing fractions of any type I prefer showing them as being more obviously top/bottom
1
-
2

Format and for that free hand is easier as typing is hard...lol
Ie
Numerator Denominator
When using a number that's a fraction it is better tro enclose it in brackets
As every indice is of the form - numberpower
The number can just as easily be a fractional number like a 1/3
So (1/3)2 is a third multiplied by itself
1/3 x 1/3 = 1x1/3x3 = 1/9
If it was (1/3)-2 then first u must get rid of the minus power by turning it into a fraction
1/(1/3)2
1/1/3 x 1/3
1/1/9
And 1 divided by a ninth =
1 to be cont - tired..lol

Apr 03, 2018 | Homework

1 Answer

Answer always appearing


Minus and change-sign are two completely different things. Minus is used to subtract one number from another. When you press minus when the input line is empty, your telling the calculator to subtract. The only way it can subtract the number you're about to put in is to subtract it from something else, and that something else is the previous answer, hence the "Ans."

If you want to input a negative number, use the change-sign key. If you want to subtract one number from another number, use the minus key.

Try pressing the plus key when the input line is empty. You'll get Ans+ in this case as well, The same with multiply and divide, among others, and for the same reason.

Sep 23, 2013 | Texas Instruments TI-84 Plus Calculator

1 Answer

Convert decimal


It means "six point one times ten to the minus four" or 0.00061 .

Read the "E" as "times ten to the". The calculator switches to scientific notation when the number is too small or too large to display using the current display mode.

Oct 13, 2012 | Texas Instruments TI-84 Plus Calculator

1 Answer

2x minus x cube plus 5x minus 2


Your question is interpreted in following way as it is not clear as cube of what & minus of what?
2x minus x cube plus 5 x minus 2

Solution 1:
= 2 x -1 x cube plus 5 x minus 2
= -2x cube plus 5 x minus 2
= cube of -2 plus 5 x minus 2
= (-8 +5) x -2
= -3 x -2
= 6

Solution2:
=2x-1x cube of +5 x -2
= -2 x 125 x -2
= 500

I think logically the solution 2 must be right. How you interpret the question is important.

sonsunny

Jul 04, 2011 | Acer Computers & Internet

1 Answer

I have a TI-83 plus calculator. I put into the calculator 96-5.970 ^2 multiplied by 0.2723 and it gave me the answer 2.4507 ^E- 4 Is there anyway to get the answer to the decimal value instead of it...


2.4507E-4 is scientific notation for 2.4507 times ten to the minus 4, or .00024507.

Take the 2.4507 and move the decimal point, to the left if the exponent is negative, to the right if it is positive, the specified number of positions.

If the magnitude of the result is too small or too large, the calculator will automatically switch to scientific notation. Imagine a number that has more than 12 digits to the left of the decimal point. How is that going to fit onto the display? Or a number that is 0 followed by the decimal point followed by 12 0s and then some significant digits?

Jun 21, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

Ok. I inherited my rangemaster 110 when I moved house. I've no manual but a digital clock with a bell, 2 strange looking things that I presume mean ho and oven, then a hand and a plus and minus button. ...


Most of these timers have 3 buttons, the hand and the plus and minus buttons. Try pressing the minus and plus buttons at the same time. The display should flash. Then adjust the time with the plus and minus buttons. If this doesn't work just try different combinations of pressing 2 buttons. If the timer is not faulty on of these combinations will work.

Feb 18, 2011 | Rangemaster Classic 110 Kitchen Range

1 Answer

One number is 11 more than another number. Find the two numbers if three times the larger number exceeds four times the smaller number by 4.


Do you need help doing your homework?

If so, here's a first attempt. It may be correct, and it may not be.
It's up to you to understand the process, and to make any needed corrections.

X minus 11 equals Y.
So, X is larger than Y.
So, 3 times X minus 33 equals 3 times Y.
Thus 3 times X equals 3 times Y plus 33.
Also, 3 times X minus 4 equals 4 times Y.

So, (3 times Y plus 33) minus 4 equals 4 times Y.

Thus 0 times Y plus 29 equals 1 times Y.

So, Y equals -27.



Dec 10, 2010 | Computers & Internet

1 Answer

2002 Harley Davidson FLSTF - FLSTFI Fat Boy how to install the starter


Hi, Devanejr there is a term in the manufacturing industry called " A Stack Up Of Tolerances" basically what this means is any part that is made or machined has very specific measurements, and can be as finite as 1 ten thousandths of an inch or 0.0001" that being said all measurements have a plus or minus number that is acceptable to fit other parts. Example an engine cylinder may have a finished measurement of 3.750" plus or minus 0.002" and the piston has a finished measurement of 3.748" plus or minus 0.002" now if you try to install a 3.748" plus 0.002" tolerance = 3.750 piston in a 3.750" minus 0.002" tolerance = 3.748" cylinder it won't fit because the piston is bigger than the cylinder. This is an extreme hypothetical example but I have seen it happen a couple of times in my 40 years of turning wrenches on motorcycles.
In your case, the starter mating surface could be off angle or the mounting holes are at the minus tolerance and the ring gear is in the plus tolerance. I would start with a 0.005" shim a the top of the starter motor to offset the negative angle to the ring gear, keeping an eye on the wear pattern, adjust the shim thickness as necessary.
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Jan 08, 2018 | 2002 Harley Davidson FLSTF - FLSTFI Fat...

1 Answer

How do I ente 8x - 1 over 10 on my TI 84 plus silve edition


Hello,
I am not sure what the cross (x) means: is it a multiplication or the variable x, so I took a screen capture of both cases.

The top case is obtained as follows the asterisk is the multiplication sign to thr right of digit 9; the small minus is the change sign key the minus sign in parentheses under digit 3 and to the left of ENTER key.; the forward slash is the division sign, above the multiplication sign.
This small minus called change sign makes a positive number negative and a negative number positive, hence its name. If your expression starts with a negative sign that is the one to use. Use it also for negative exponents.

As you can see the result is -.8. Notice how the - before the dot is small with respect to the regular minus, as in the last expression.

For the last expression on the screen capture, there is nothing special, except that you have two ways to enter the variable X.

1. Press [ALPHA] [STO->]
2. Press the key [X,T, Theta, n] to the right of the green [ALPHA] key.

Hope it helps.

febc94d.jpg

If x is the multiplication sign
8[x] [(] (-)1

Oct 06, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

Plus or Minus Sign


I'm assuming you want the +/- symbol like you see in the quadratic formula. There is no key to enter this. You will have to enter 2 separate problems. Enter the numbers with the + symbol and then enter the numbers with the - symbol.

Jun 05, 2009 | Texas Instruments TI-84 Plus Calculator

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