Answer: 22 signs
Step-by-step explanation:
First find out how many feet are in a mile.
A mile = 5,280 feet
There are signs every 240 ft so the number of signs are:
= 5,280/240
= 22 signs
<em>There is a sign at the beginning and one at the end both of which are already account for in the 22.</em>
Answer:
x = 80
Step-by-step explanation:
the sum of the 3 angles in a triangle = 180°
sum the 3 angles and equate to 180
70 + 30 + x = 180
100 + x = 180 ( subtract 100 from both sides )
x = 80
Answer:
<em>Cathy was born in 1980 and she was 18 years old in 1998</em>
Step-by-step explanation:
<u>Equations</u>
This is a special type of equations where all the unknowns must be integers and limited to a range [0,9] because they are the digits of a number.
Let's say Cathy was born in the year x formed by the ordered digits abcd. A number expressed by its digits can be calculated as

In 1998, Cathy's age was

And it must be equal to the sum of the four digits

Rearranging

We are sure a=1, b=9 because Cathy's age is limited to having been born in the same century and millennium. Thus

Operating

If now we try some values for c we notice there is only one possible valid combination, since c and d must be integers in the range [0,9]
c=8, d=0
Thus, Cathy was born in 1980 and she was 18 years old in 1998. Note that 1+9+8+0=18
I believe the answer is B
With the information, you gave me, I know that n is a variable that needs to be solved for. If you did not provide enough information, for some reason and that was the wrong concept, comment below and I'll help you out.
Also a rule to keep in mind is "What you do to one side, you do to the other."
The image attached shows you how the problem is done.
If you have any questions, just comment them below! :)