Denise bought a t-shirt at the sale price of $25 the original cost of the t-shirt was $40 what percent represents the discount that denise received when buying the t-shirt

37.50%

Step-by-step explanation:

Use the formula: Old Value minus New Value (in absolute value bars) divided by Old Value times 100

New Value = $25 / Old Value = $40

$40 - $25 =  $15

$15 divided by $40 is 0.375

0.375 times 100 (0.375 x 100) is 37.50

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:

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64