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aleksley [76]
3 years ago
11

If five times of a number is 125 then 0•8 of this number is​

Mathematics
1 answer:
Nady [450]3 years ago
5 0

Answer:

20

Step-by-step explanation:

5n = 125

n = 25

0.8 x 25 = 20

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Step-by-step explanation:

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7 0
3 years ago
What is the area of a regular octagon with a apothem of 16 inches long and a side of 19 in Long round the answers to the nearest
azamat
To find the area of any regular (regular means all sides are = and all angles are =)  poylgon when you know the length of the apothem and the length of the side you can use the formula:
A = (1/2)ap where a = the length of the apothem and p = the perimeter of the polygon. You can also use n*s in place of p where n = the number of sides of the polygon and s = the length of the side.

A= (1/2)(16)(19*8) (An octagon has 8 sides.)
A = 1216 in^2
3 0
3 years ago
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If a 20 ft tree casts a 15ft shadow, how long a shadow is cast​
Irina-Kira [14]

Answer:

25 ft

Step-by-step explanation:

c = √a^2 + b^2 = √20^2 + 15^2 = 25ft

Hooke me up with a 5 star and a thanks :)

4 0
2 years ago
Evaluate the expression when a= 4, b= - 2, and c= 7 - -> 5a - 9 (b - c)
ollegr [7]

Answer:

65

Step-by-step explanation:

Given the following question:

5a-9(b-c)
a = 4
b = 2
c = 7

In order to find the answer, we need to substitute the variables with the numbers given, and then solve using PEMDAS.

5\times4-9\times(2-7)
2-7=-5
5\times4-9\times-5
5\times4=20
20-9\times-5
9\times-5=-45
20--45
20+45=65
=65

Hope this helps.

8 0
2 years ago
Does the relation y=x^2-1 defines y as a function of x
Reil [10]

Answer:

Yes.

From Definition - A special relationship where each input has a single output.

Check if there is going to be one y for one x.

Step-by-step explanation:

  1. Re-write it in terms of y=…., meaning solve for y
  2. If it looks like you have two equations then it is a relationship -case a
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7 0
3 years ago
Read 2 more answers
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