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Mathematics

1 answer:

vekshin12 years ago

3 0

Answer:

Step-by-step explanation:

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Slav-nsk [51]

The denominator is 20

5X4= 20

8 0

3 years ago

Is ab perpendicular to cd ? Explain.

Afina-wow [57]

We know that
if two lines are perpendicular
then
the slopes
m1*m2=-1

step 1
find the slope AB
A (0,2)
B (-3,-3)
m=(y2-y1)/(x2-x1)-----> m=(-3-2)/(-3-0)-----> m=-5/-3----> m1=5/3

step 2
find the slope CD
C (-4,1)
D (0,-2)
m=(y2-y1)/(x2-x1)-----> m=(-2-1)/(0+4)-----> m=--3/4----> m2=-3/4

step 3
multiply mi*m2
(5/3)*(-3/4)-----> -15/12
so
15/12 is not -1
therefore
AB is not perpendicular to CD

4 0

3 years ago

A charter boat travels at a maximum rate of 25 miles per hour. The function d(x) = 25x represents the distance d(x), in miles, t

posledela

Answer:

Step-by-step explanation:

7 0

3 years ago

Solve the system using substitution:<br> X+Y=5<br> Y=X - 9

makvit [3.9K]

Answer:

x = 7

y = -2

Step-by-step explanation:

There are 2 equations. The substitution method takes one equation and puts it into the other and solves for 1 variable. Then you take that answer and put into any one equation and solve for the other variable.

Since equation #2 is already given for y = SOMETHING, we take that something and put it into "y" of the 1st equation. Shown below:

$x+y=5\\x+(x-9)=5\\x+x-9=5\\2x=5+9\\2x=14\\x=\frac{14}{2}\\x=7$