geometry

What is the value of a if ab + ac = 21 and b + c = 7?

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  1. [/m \\computer][/t xxx][/d [p|u:]xx:yy [/c "comment"]]

    No args Display help. This is the same as typing /?.
    /? Display help. This is the same as not typing any opti
    /i Display the graphical user interface (GUI).
    This must be the first option.
    /l Log off. This cannot be used with /m or /d options.
    /s Shutdown the computer.
    /r Shutdown and restart the computer.
    /g Shutdown and restart the computer. After the system i
    rebooted, restart any registered applications.
    /a Abort a system shutdown.
    This can only be used during the time-out period.
    /p Turn off the local computer with no time-out or warni
    Can be used with /d and /f options.
    /h Hibernate the local computer.
    Can be used with the /f option.
    /e Document the reason for an unexpected shutdown of a c
    /m \\computer Specify the target computer.
    /t xxx Set the time-out period before shutdown to xxx second
    The valid range is 0-315360000 (10 years), with a def
    If the timeout period is greater than 0, the /f param
    implied.
    /c "comment" Comment on the reason for the restart or shutdown.
    Maximum of 512 characters allowed.
    /f Force running applications to close without forewarni
    The /f parameter is implied when a value greater than
    specified for the /t parameter.
    /d [p|u:]xx:yy Provide the reason for the restart or shutdown.
    p indicates that the restart or shutdown is planned.
    u indicates that the reason is user defined.
    If neither p nor u is specified the restart or shutdo
    unplanned.
    xx is the major reason number (positive integer less
    yy is the minor reason number (positive integer less

    sons on this computer:
    = Expected U = Unexpected P = planned, C = customer defined)
    e Major Minor Title

    0 0 Other (Unplanned)
    0 0 Other (Unplanned)
    0 0 Other (Planned)
    0 5 Other Failure: System Unresponsive
    1 1 Hardware: Maintenance (Unplanned)
    1 1 Hardware: Maintenance (Planned)
    1 2 Hardware: Installation (Unplanned)
    1 2 Hardware: Installation (Planned)
    2 2 Operating System: Recovery (Planned)
    2 2 Operating System: Recovery (Planned)
    2 3 Operating System: Upgrade (Planned)
    2 4 Operating System: Reconfiguration (Unplanned
    2 4 Operating System: Reconfiguration (Planned)
    2 16 Operating System: Service pack (Planned)
    2 17 Operating System: Hot fix (Unplanned)
    2 17 Operating System: Hot fix (Planned)
    2 18 Operating System: Security fix (Unplanned)
    2 18 Operating System: Security fix (Planned)
    4 1 Application: Maintenance (Unplanned)
    4 1 Application: Maintenance (Planned)
    4 2 Application: Installation (Planned)
    4 5 Application: Unresponsive
    4 6 Application: Unstable
    5 15 System Failure: Stop error
    5 19 Security issue
    5 19 Security issue
    5 19 Security issue
    5 20 Loss of network connectivity (Unplanned)
    6 11 Power Failure: Cord Unplugged
    6 12 Power Failure: Environment
    7 0 Legacy API shutdown

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  2. Good answer, HACKER. git.

    Now, on to the problem.

    We have ab + ac = 21. But, we can factor out the a to get a(b+c) = 21. They have also given b+c = 7, so a(7) = 21. That means a=3.

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