How many different seven-digit telephone numbers can be formed if the first digit cannot be zero or one and the second digit can only be a seven?

Total: 9*9P6 = 9*60480=544,320 ways

11.2

step-by-step explanation:

when doing tangent the tangent of the angle is equal to the opposite side from the angle over the adjacent side to the angle.

tan43 = x / 12

move 12 over by multiplying each side by 12

12tan43 = x

x = about 11.2