PLLZZ HELP ASAP 10 POINTS! :( its math and plz do both <3 ):

8(x-6) at x=-1  is -56     &   2a² - 2a - 15 at a =13  is 297

Step-by-step explanation:

sub x = -1 into 8(x-6) which becomes 8(-1-6) which is equal to 8 x -7 = -56

Sub a = 13 into 2a²-2a-15 =  2(13²)  - 2(13) - 15  =  338 - 26 - 15 = 297

17.08

correct me if i am wrong.

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.

click to let others know, how is it

0.0

0 votes

1

report

read more on -

step-by-step explanation: