Solve for x . 3x +19 7x-19 50°

x =12

Step-by-step explanation:

The sum of the angles of the triangle are 180 degrees

3x+19 + 7x-9 +50 = 180

Combine like terms

10x +60 = 180

Subtract 60 from each side

10x+60-60 = 180-60

10x = 120

Divide each side by 10

10x/10 = 120/10

x= 12

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

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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: