# 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?
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?
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?
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?
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?
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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