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SCORPION-xisa [38]
2 years ago
12

Would someone help me

Mathematics
1 answer:
melamori03 [73]2 years ago
5 0
The angle AEC is opposite the angle DEB 
the angle AEC is equal
9x + 12 = 2x + 30
9x - 2x   = 30 - 12
     7x      =   18 
        x      = 2.57 
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Please help. i don't understand
zaharov [31]

78×.33=25.74 busses are new

25.74+15=40.74 new busses

78+15=93 total busses

40.74/78=0.5223076923= 52% will be new with the new 15 busses

4 0
3 years ago
Plz answer :)
Lisa [10]

Answer:

A. x + y > 30 8x + 10y ≥ 450

Step-by-step explanation:

x+y bunnies and puppies has to be greater than 30 (in amount)

the amount of money need to be greater than or equal to 450 for both x bunnies and y puppies.

5 0
3 years ago
Riley has 78 postcards she wants to put 6 on each poster board. How many poster boards will she need
nirvana33 [79]
13, because 78 postcards divided by 6 cards per board = 13 poster boards 
6 0
2 years ago
The probability of drawing a heart from a standard deck of cards is 0.25. You record the car do you draw and return the car befo
Licemer1 [7]

Answer: C) 0.112

Step-by-step explanation:

In binomial distribution with parameters n (Total trails) and p (probability of getting success sin each trial) , the probability of getting success in x trials is given by :-

P(X=x)=^nC_xp^x(1-p)^{n-x}

Given : The probability of drawing a heart from a standard deck of cards is 0.25

Here , getting heart is the success.

Then p= 0.25

For n= 20

The probability that you will draw a heart seven times i.e. x= 7:

P(X=7)=^{20}C_7(0.25)^7(1-0.25)^{20-7}

P(X=7)=\dfrac{20!}{7!(20-7)!}(0.25)^7(1-0.25)^{20-7}\ \ [\because\ ^nC_r=\dfrac{n!}{r!(n-r)!}]

=\dfrac{20\times19\times18\times17\times16\times15\times14\times13!}{7!13!}(0.25)^7(0.75)^{13}\\\\=77520(0.00006103515625)(0.0237572640181)\\\\=0.112406195476\approx0.112

Hence, the probability that you will draw a heart seven times = 0.112

Thus , the correct answer is C) 0.112 .

8 0
3 years ago
Which could be the first step in solving this system of equations by substitution?
Ainat [17]

Answer:

The first step is to replace the y in y-x=15 with 7x (we can do this because the first equation tells us that they're equal)

solve and get

(2.5,17.5)

or x= 2.5 y=17.5

Step-by-step explanation:

The first step is to recognize that y=7x which means that we can just replace the y in the second equation with 7x

7x-x=15

6x=15

x=2.5

Then we can solve for y

y=7(2.5)

y=17.5

3 0
2 years ago
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