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snow_lady [41]
3 years ago
9

7th grade work ! I’ll give brainliest!

Mathematics
1 answer:
marysya [2.9K]3 years ago
3 0

Answer:

Step-by-step explanation:

-418 + 387 - 94 - 132

-31 - 94 - 132

-125 - 132= -257 feet

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Engineers want to design brakes that will reduce stopping distances by 10%. How would this change the equation relating speed s,
AlekseyPX
For the answer to the question above,  we will use this formula to solve this problem
<span>d = kv^2 </span>

<span>plugging in, </span>
<span>4.2 = k*10^2 </span>
<span>k = 0.042 </span>

<span>d = 0.042v^2 </span>

<span>the revoised equation will be </span>
<span>d = 0.9*0.042v^2 , i.e. </span>

<span>d = 0.0378v^2 

I hope my answer helped you</span>
8 0
4 years ago
Alden has 5 siblings. His sister is 5 years older than he is and 3 times as old as his second sister. Alden's brother is 4 years
salantis [7]

Answer:Alden is 13 years old

Step-by-step explanation

Let x represent Alden's age.

Let y represent the age of his sister.

Let z represent the age of his second sister.

His sister is 5 years older than he is and 3 times as old as his second sister. This means that

y = x + 5

y = 3z

Alden's brother is 4 years younger than his second sister. It means that his brother's age is

z - 4

His brother is 2. It means that

z - 4 = 2

z = 2 + 4 = 6

y = 3z

y = 3 × 6 = 18

Substituting y = 18 into y = x + 5, it becomes

18 = x + 5

x = 18 - 5 = 13

8 0
3 years ago
Twenty-one students took a mathematics test. The 11th highest score on the test was a 76. Which of the
Tcecarenko [31]

Answer:

C. The median of the test scores was 76

Step-by-step explanation:

The median is the middle value. In 21 values, the 11th value is the middle value, so it must be the median.

Answer: C. The median of the test scores was 76

3 0
3 years ago
Read 2 more answers
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notice the equations in slope-intercept form, the first one has a slope of -1, the second one has a slope of 1.

if the slopes are equal, and the constant is different, they lines are parallel.

if the slopes are equal, and the constant is the same the equations are exactly the same thing, and the lines are coincident, on slapped on top of the other.

if the slopes differ, like here, then they have a solution, where they intersect.
4 0
3 years ago
Suppose a city with population 600, 000 been growing at a rate of 3% per year. If this rate continues, find the population of th
Yanka [14]

Answer:

600,000(1+0.03)^20 that’s your equation. use a calculator. remove decimals from your answer because its not possible

5 0
3 years ago
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