2. If 6x - 3y = 4 and 5x – 2y = - 7, what does x - y equal? A, 11
B-2
C. 71/3
D. - 23/3
E. NOTA

expression #3 is not equivalent. the others are.

hi! i think the answer is 1/2 : )

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: