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IgorLugansk [536]
3 years ago
11

Can you help with both questions 4 and 5?

Mathematics
2 answers:
cupoosta [38]3 years ago
8 0
Well since the triangle is split into 2 triangles and they both are the same size so BD on the bottom is 15 which means naturally BC must be 30. Five I'm not sure about
sergejj [24]3 years ago
3 0
4.  b 

5. d
Interior Angle Sum Thereom S = 180(n - 2)  S being sum of the measures of its interior angles , n is for sides

360 degrees looking at the shape ABDC as a whole.. 180 looking at it as CAD
90+26= 116
180-116
64  
Angles 
C = 90degrees
A= 26 degrees
D= 64degrees
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I am confused about ii) help please
Jobisdone [24]

Step-by-step explanation:

i)=

m=2/3

x=-3

y = 5

now

y=mx+c

or, 5 = 2/3× -3 + c

or, 5 = -2+c

c =7

now,

y= mx + c

or, y = 2/3×x+7

or, y = 2x/3+7

or, 3y = 2x+21

so, 3y-2x=21

equation would be 3y-2x=21.

now

ii)=

if slope of 3y-2x=21 and 2x-3y = 0 are same, they are parallel.

2x-3y = 0

2x = 3y

lets suppose x is 9

now

2x=3y

2×9 = 3y

or, 18 = 3y

so, y = 6

one coordinate would be (9,6) now

lets again suppose x is 3

2x=3y

2×3 = 3y

or, 6 = 3y

so, y = 2

another coordinate is (3,2)

now lets find slope

x1=9,y1=6

x2=3,y2=2

slope = (y2-y1)/(x2-x1)

= (2-6)/(3-9)

= -4/-6

= 2/3

Since, slope of 3y-2x=21 and 2x-3y has same slope 2/3, they are parallel.

6 0
2 years ago
Helppp! Is Figure A’B’C’D’ a reflection of Figure ABCD? Explain. *
Korolek [52]
Yes. It would be a reflection over the line.
8 0
3 years ago
X+x+x+x-20 what expression is equivalent to it?
igor_vitrenko [27]
X + x + x + x - 20 is equivalent to 4x - 20 because you can add the like terms, or the x's.
5 0
3 years ago
Read 2 more answers
A math class's mean test score is 88.4. The standard deviation is 4.0. If Kimmie scored 85.9, what is her z-score
kvv77 [185]

The z-score of Kimmie is -0.625

<h3>Calculating z-score</h3>

The formula for calculating the z-score is expressed as;

z = x-η/s

where

η is the mean

s is the standard deviation

x is the Kimmie score

Substitute the given parameter

z = 85.9-88.4/4.0

z = -2.5/4.0

z = -0.625

Hence the z-score of Kimmie is -0.625

Learn more on z-score here: brainly.com/question/25638875

#SPJ1

5 0
2 years ago
Hi, thx for helping​
Sliva [168]

Answer:

C. 8.52624...

Step-by-step explanation:

The reason that C is different is because all of the other decimals are terminating decimals (meaning that they end or stop), while C is a repeating decimal, because it never ends.

7 0
3 years ago
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