Samantha asked for a loan from the bank of 4,500 plans to repay it in 4 years Samantha will have to repay it 900 of interest what is the simple interest rate

5

Step-by-step explanation:

S.I is defined mathematically as

[P x R xT]/100

P -Principal amount borrowed

R- the rate

T -time duration

S.I -simple interest [in this case 900]

S.I =[4500 x R x 4]/100

900 =[4500 x R x 4]/100

900x100 = 4500 x 4 x R

[900 x 100]/[4500 x 4] = R [by changing the subject of the formula to reflect R on the right side; you divide both sides by 4500 x 4]

90000/18000 =5

5=R

Rate =5%

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:

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72