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Liula [17]
3 years ago
11

If the sum of a number and seven is doubled, the result is one less than the number. find the number

Mathematics
1 answer:
lawyer [7]3 years ago
7 0
(n + 7)2 = n - 1
2n +14 = n - 1
2n - n +14 = n - n - 1
n + 14 -14 = -1 - 14
n = -15
(-15 + 7)2 = -15 - 1
(-8)2 = -16
-16 = -16
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A tractor costs $16,900 and depreciates in value by 13% per year. How much will the tractor be worth after 8 years?
Assoli18 [71]

Answer: $-676

Step-by-step explanation:

Multiply 13% or 0.13 by the 16,900 to get 2,197. Multiply the 2,197 by 8 because that’s how many years there are and you get 17,576 then subtract that from the 16,900 to get -676 which means that the tractor would be worth pretty much nothing

8 0
3 years ago
A kayaker can paddle 12 mi in 2 h moving with the river current. Paddling at the same pace, the trip back against takes 4 h. Ass
Firdavs [7]
Downstream DATA:
distance = 12 miles 
time = 2 hours 
rate = 12/2 = 6 mph
----------------
Upstream DATA:
distance = 12 miles 
time = 4 hrs 
rate = 12/4 = 3 mph
----
Equations:
Downstream: b + c = 6
Upstream::: b - c = 3
------
Add to get:
2b = 9
b = 4.5 mph (speed of the boat in still water.)
-----
Solve for "c":
b + c = 6
4.5 + c = 6
c = 1.5 mph (speed of the current)
The answer is 1.5 mph
7 0
3 years ago
The figure is made by attaching semicircles to each side of an 11-ft-by-11-ft
vova2212 [387]

Answer:

by how much degrees should the heat be reduced in the last 5 minutes of banking

6 0
3 years ago
In London, the charge of a tour bus consists of a fixed rental price plus a per kilometre rate, that depends on the distance of
ella [17]

Using a linear function, we have that:

a) The fixed cost is of $10.

b) The equation is: C = 10 + 12d.

c) The cost of an 18 km trip is $226.

d) The distance traveled is of 20 km.

<h3>What is a linear function?</h3>

A linear function is modeled by:

y = mx + b

In which:

  • m is the slope, which is the rate of change, that is, by how much y changes when x changes by 1.
  • b is the y-intercept, which is the value of y when x = 0, and can also be interpreted as the initial value of the function.

For this problem, the slope is of m = 12. When d = 5, C(d) = 70, hence we find the fixed cost as follows:

C(d) = 12d + b

70 = 60 + b

b = 10.

Hence the equation is:

C(d) = 12d + 10.

For a trip of 18 km, d = 18, hence the cost is:

C(12) = 12 x 18 + 10 = $226.

When the cost is of $250, the distance is found as follows:

250 = 12d + 10

12d = 240

d = 240/12

d = 20 km.

More can be learned about linear functions at brainly.com/question/24808124

#SPJ1

6 0
1 year ago
PLEASE HELP...PLEASEEEEEEEEEEE
Nata [24]

Answer:

This is not a good model because the residual plot becomes thicker at the end

6 0
3 years ago
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