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pishuonlain [190]
3 years ago
12

What are these two answers,explanation needed

Mathematics
2 answers:
Korolek [52]3 years ago
5 0
1. Should be -15
2. Should be 4
Stella [2.4K]3 years ago
3 0

Step-by-step explanation:

1) k(x)= -3x²-3

k (-2)= -3×(-2)²-3

= -12-3

= -15

3)k(a)=a+4

k(0)= 0+4=4

hope it helps.

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Given ∆QRS≅∆TUV, QS=4v+3, and TV=7v−9, find the length of QS and TV.?
Goryan [66]
If <span>∆QRS≅∆TUV, Their corresponding sides would be equal so, 
QS = TV
4v + 3 = 7v - 9
7v - 4v = 3 + 9
3v = 12
v = 4

Now, QS = TV = 4(4) + 3 = 16 + 3 = 19

In short, Your Answer would be Option C

Hope this helps!</span>
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What is the area of parallelogram ABCD?<br><br><br> ____ square units
valentinak56 [21]

Answer:

13

Step-by-step explanation:

Here's a method of finding the area of any polygon knowing its vertices. I'm using this parallelogram as an example.

Make a table like this (each vertex with its x- and y-coordinates):

Pt    x       y

A     3      6

B     6      5

C     5      1

D     2      2

A     3      6

Now multiply each x-coordinate by the y-coordinate on the line below and write it on the right side. Bold type shows the first multiplication.

       x       y

A     3      6

B     6      5      15

C     5      1        6

D     2      2      10

A     3      6      12

Now multiply each y-coordinate by the x-coordinate on the line below and subtract from each produce you already have. Do each subtraction. Bold type shows the first multiplication.

       x       y

A     3     6

B     6      5      15 - 36 = -21

C     5      1        6 - 25 = -19

D     2      2      10 - 2 =     8

A     3      6      12 - 6 =     6

Add all the differences.

       x       y

A     3      6

B     6      5      15 - 36 = -21

C     5      1        6 - 25 = -19

D     2      2      10 - 2 =     8

A     3      6      12 - 6 =     6

                                   +____

                                       -26

The area of the polygon is the absolute value of half of the sum of the differences.

area = |-26/2| = |-13| = 13

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