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marin [14]
3 years ago
14

Write the equation of a line that is perpendicular to the line y=4 and passes through point (-1, 1)​

Mathematics
1 answer:
ipn [44]3 years ago
6 0

Answer:

x = - 1

Step-by-step explanation:

y = 4 is the equation of a horizontal line parallel to the x- axis and passing through all points with a y- coordinate of 4

A perpendicular line is a vertical line parallel to the y- axis with equation

x = c

where c is the value of the x- coordinates the line passes through

The line passes through (- 1, 1) with an x- coordinate of - 1, thus

The equation of the perpendicular line is x = - 1

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How many 3 digit palindromes are divisible by 9?
ludmilkaskok [199]

Interesting problem.

A palindrome is a number which is identical when read/interpreted left-to-right or right-to-left.   For example, 14241 is a palindrome, so is 444444.


A three digit palindrome must be made up of two distinct digits only, one for the first and last digits, and one for the middle, for example, 424, or 515, etc.


For a number to be divisible by 9, the sum of the digits must add up to a multiple of 9, such as 0, 9, 18, 27, etc.


We can now form a table of the possible 3-digit palindromes divisible by 9, starting with the first/last digits (=A), and finding the middle digit (=B).  The number is therefore represented by the pattern ABA.

For example, when A=1, we have the number 1B1.  For the number to be divisible by 9, B=7 so that sum=1+7+1=9, which is divisible by 9.

For each value of A (from 1 to 9) we can only find one value of B that makes the number divisible by 9.   Thus we can only find nine such numbers, with A equal to 1 to 9.

Here's a list of the numbers

A   B   number

1    7    171

2   5    252

3   3    333

4   1     414

5   8    585

6   6    666

7   4    747

8   2   828

9   0   909

3 0
3 years ago
Help me out !?!??!?!l
Vlada [557]

Answer:67 is correct D

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4 0
2 years ago
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