PLEASE HELP ASAP JUST THE FIRST ONE!!! I WILL MARK BRAINLIEST

x = 5, x = 7

Step-by-step explanation:

tangents from an external point to a circle are congruent , then

x² = 12x - 35 ( subtract 12x - 35 from both sides )

x² - 12x + 35 = 0

(x - 5)(x - 7) = 0

equate each factor to zero  and solve for x

x - 5 = 0 ⇒ x = 5

x - 7 = 0 ⇒ x = 7

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: