Select all of the following that are quadratic functions.
x= 3x2 - 6y +5
y+3 =-2x2+5
y= 2x2 - 8 x + 6
y=-7x-4
y-3x = 4 x 3 – x2 + 9
y = 5 x(x + 9) - 8
y-2x2 = 3x - 2x2 + 4

1; 35 is the ratio

step-by-step explanation:

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:

2 x 503

step-by-step explanation:

its 1006