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ddd [48]
3 years ago
8

the angles of a quadrilateral measure 80°,100°,100°,and 80° in this order.what kind of quadrilateral has this shape? how do you

know ?
Mathematics
1 answer:
nlexa [21]3 years ago
5 0
It has two pairs of same angles: that means that the opposite sides are parallel: this makes it a parallelogram.
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Solve the problem in the picture please
Salsk061 [2.6K]
(1) y= - x² - 4x + 9 and (2) y + 5x = - 7. Isolate y in (2); y= - 5x - 7 (3)

Since (1) and (3) have the same value or the same y, then we can write:
(1)=(3)

- x² - 4x + 9 = - 5x - 7

-x² - 4x + 9 + 5x +7 = 0

-x² + x + 16 = 0  OR x² - x - 16 = 0

Solve this quadratic equation:

x' = [-b+√(b²-4ac)]/(2a) and x" = [-b-√(b²-4ac)]/(2a)

x' = [+1+√(-1)² - 4(1)(-16)]/2 → x' = [1+√(1+64)]/2 → x' = [1+√65)]/2
x" = [+1-√(-1)² - 4(1)(-16)]/2 → x' = [1-√(1+64)]/2 → x' = [1-√65)]/2

x' = [1+√65)]/2 = + 4.5311


x" =[1-√65)]/2 = - 3.5311
5 0
3 years ago
Question 20 (5 points)
igor_vitrenko [27]

Answer:

Step-by-step explanation:

What you gave 4x – y = 7 is in standard form

The problem on screen

4x-2/3y=7

The standard form is 12x-2y=21

Answer is A

3 0
3 years ago
Find f(-3).<br> f(x) = 4(2)^x
Ray Of Light [21]
Answer:

D - 1/2

Explanation:

f(-3) = 4(2)^-3

f(-3) = 4 • 1/8

f(-3) = 1/2
4 0
3 years ago
What is the rule for the reflection​
emmasim [6.3K]

Answer:

The third one

Step-by-step explanation:

It transitions into the negative x

4 0
3 years ago
A point with coordinates (a, b) is plotted on a coordinated plane. The values of a and b can be any positive or negative integer
Diano4ka-milaya [45]

Answer:

Any negative and positive number can be your coordinates.

Step-by-step explanation:

As long as you don't have any restrictions as to what the coordinates can be, you're good to go!

Hope this helps!

8 0
3 years ago
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