3. Evaluate the expression if a=3 and b=4.
a) 2+ab =
b) 3a-7=
3(a-b)=

a=14

b=2

c=3

Step-by-step explanation:

a) 2+ab= 2+(3*4)

= 2+12

= 14

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:

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2