Solve the problem.
mark can remember only the first 4 digits of his friend's phone number. he also knows that the number has 7 digits and that the last digit is not a 0. if mark were to dial all of the possible numbers and if it takes him 21 seconds to try each one, how long would it take to try every possibility?

step-by-step explanation:

here's what happens:

1) the graph of f   = x^2 is shifted 2 units to the right.

2) the resulting graph is reflected in the x-axis, so that the parabola now opens down.

3) this final result is transformed up by 5 units.

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: