A jar contains n nickels and d dimes. There are 20 coins in the jar, and the total value of the coins is $1.45. How many nickels and how many dimes are in the jar? (Hint: Nickels are worth $0.05 and dimes are worth $0.10.)

9 dimes and 11 nickels

Step-by-step explanation:

because 9 dimes is 90 cents, and then 11 nickels would be 55 cents

There are 13 nickels and 5 dimes in the jar.

Total number of coins = 18

Step-by-step explanation:

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: