math(PLEase help me check.)

1)
C=md+t

The cost C, of a business trip is represented by the equation above, where m is a constant, d is the number of days of the complete trip, and t is the cost of transportation, which doesn't change. If the business trip was increased by 5 days, how much more did the business trip cost than the original trip?

A)5d
B)5m
C)5t
D)d(m-3)
E)m(d-3)
^I got E

2)
4x-3y=9
8x+ky +19

For which value of k will the system of the equations above have no solution?

A) 6
B)3
C)0
D)-3
E)-6
^I do not know

3)A population that starts at 100 and doubles after eight years can be expressed as the following where t stands for the number of years that have elapsed from the start:
A)100 x 2^(t)
B)100 x 2^(t/7)
C)100 x 2^(t-8)
D)100 x 2 ^ (t/8)
E)100 x 2^(16t)
^I got D

If I got a question wrong can you please explain why?

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  1. 1)
    C=md+t

    The cost C, of a business trip is represented by the equation above, where m is a constant, d is the number of days of the complete trip, and t is the cost of transportation, which doesn't change. If the business trip was increased by 5 days, how much more did the business trip cost than the original trip?

    A)5d
    B)5m
    C)5t
    D)d(m-3)
    E)m(d-3)
    ^I got E
    ===============================
    I did NOT get E
    for CHANGE with number of days you use the SLOPE m times the change in umber of days
    ***********************************
    2)
    4x-3y=9
    8x+ky +19

    For which value of k will the system of the equations above have no solution?

    A) 6
    B)3
    C)0
    D)-3
    E)-6
    ^I do not know
    =================================
    if the ratio of y to x, which is the SLOPE is the same, the lines will be parallel and never cross
    4x-3y=9
    8x-6y +19
    *******************************

    3)A population that starts at 100 and doubles after eight years can be expressed as the following where t stands for the number of years that have elapsed from the start:
    A)100 x 2^(t)
    B)100 x 2^(t/7)
    C)100 x 2^(t-8)
    D)100 x 2 ^ (t/8)
    E)100 x 2^(16t)
    ^I got D
    =====================
    YES !!!!
    ********************
    If I got a question wrong can you please explain why?

    1. 👍 0
    2. 👎 0
  2. 2. What is double -3?

    you are correct on 3)

    you are wrong on 1)

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    2. 👎 0
    👨‍🏫
    bobpursley
  3. Is 1) B?

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    2. 👎 0

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