math

A submarine is traveling underwater when its pilot decides to dive deeper into the water. The depth, D, in meters of the submarine t minutes after the dive is represented by the function D(t)=70+45t. What is the depth of the submarine when it starts to dive?(1 point)

70 meters

25 meters

45 meters

115 meters

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  1. At the start of the dive, t = 0.

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  2. I'm just not sure how to solve it do I graph it? @PsyDAG

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  3. Here are the answers to the Interpreting Linear Functions Quick Check.

    1. Leigh is renting a moving van. The function C(d)=0.12d+25 is used to relate the cost, C, in dollars of the rental after Leigh uses the van for d miles. What is the interpretation of the slope for this function?
    Answer:
    The additional cost is $0.12 for each additional mile the van is driven.

    2. Austin works as an electrician. If a job requires Austin to work on weekends, the function C(t)=54t+75 represents the customer's cost, C, in dollars of working t hours on the job. What is the interpretation of the y-intercept?
    Answer:
    Austin charges the customer $75 before starting on a weekend job.

    3. A plane starts to descend to prepare for landing. The height of the plane, h, in meters can be represented as the function h(t)=−95t+3800 where t is the number of minutes after the plane starts its descent. What is the meaning of the 3,800 in the equation of the function?
    Answer:
    The height of the plane is 3,800 meters when it begins to descend.

    4. The first step of a staircase that leads to an outdoor deck is above a concrete slab. The height, h, in centimeters of the n step of the staircase above the ground can be represented by the function h(n)=25n+3. Which of the following is a correct interpretation of the function?
    Answer:
    The concrete slab is 3 cm tall.

    5. A submarine is traveling underwater when its pilot decides to dive deeper into the water. The depth, D, in meters of the submarine t minutes after the dive is represented by the function D(t)=70+45t. What is the depth of the submarine when it starts to dive?
    Answer:
    70 meters

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  4. I'm sorry that I couldn't put a shortened answer list down. But the answers are switched around and put in different order. That means A for someone can be a C for someone else.

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  5. 1. The additional cost is $0.12 for each additional mile the van is driven.
    2. Austin charges the customer $75 before starting on a weekend job.
    3. The height of the plane is 3,800 meters when it begins to descend.
    4. The concrete slab is 3 cm tall.
    5. 70 meters

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