3 cos 68º.cosec 22° – [tan 30° tan 43°. tan 47°.
tan 12°. tan 60° tan 78°) =?​

expression #3 is not equivalent. the others are.

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8