You and your sister go to the store. You buy 3 erasers for a $1.00 . Your sister buys 4 erasers for $1.25 . Explain who gets the better deal .

Your sister

Step-by-step explanation:

To determine those with better deal we will have to do some calculations

So let's start

You bought the 3 erasers for$1.00

So we will have to determine the amount you bought 1

3 erasers=$1.0

1 eraser=x

Cross multiply

3x=1

X=1/3

X=0.33333

Your sister bought 4 erasers for $1.25

So 1 eraser=x

Cross multiply

4x=1.25

X=1.25/4

X=0.3125

So we will have to compare the two prices and we will discover that your sister gets the better deal

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.