If 5r + 4 = -4 – (6r – 8), then
–4r = ?

a)12
b) -2
c)-8
d) 0

Step-by-step explanation:

Given

Required

Find - 4r

Open bracket

Collect Like Terms

Solve for r

Multiply both sides by -4

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: