What is the value of x

x = 15

Step-by-step explanation:

according to Altitude Theorem, we can set up this proportion:

9/RT = RT/16

RT² = 9(16)

RT² = 144

RT =

RT = 12

In right triangle STR, we can find 'x' by using the Pythagorean Theorem:

9² + 12² = x²

81 + 144 = x²

225 = x²

x = √225 = 15

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)