A number increased by its product with 7 equals 48. Find the number. • 6
• 8
• 10
• 41

x = 6

Step-by-step explanation:

x + 7x = 48

8x = 48

6

Step-by-step explanation:

x+7x=48

8x=48

x= 48/8

x=6

The first choice

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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: