Tiana and Rachel each have a record collection. • The number of records in Tiana’s collection can be represented by x. • The number of records in Rachel’s collection is 4 times the number of records in Tiana’s collection.
• The total number of records in both collections is 160.

What is x, the number of records in Tiana’s collection?

answer: it's upside down and i can't read it

step-by-step explanation:

if you was gonna solve for a, a is a   < -12

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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: