Amy loaned \$5$5dollar sign, 5 to each of 202020 people. she recorded each loan by writing -\$5−$5minus, dollar sign, 5 in her bank book. what is the total change in the amount of money amy had before the loans?

  -$100

Step-by-step explanation:

If Amy subtracted $5 from her bank balance 20 times, it is ...

  $5 × 20 = $100

less than it was.

The amount of change totaled -$100.

$-100

Step-by-step explanation:

Khan Academy

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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