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viktelen [127]
3 years ago
8

Need help asap!

Mathematics
1 answer:
Ira Lisetskai [31]3 years ago
6 0
Answers

1. Solve inside bracket first

7x^2+4x-26+7x^2+3x-15

= (14x^2+7x-41) Answer

2. 5x(6x^2+3x+7)-1(6x^2+3x+7)
= 30x^3+15x^2+35x-6x^2-3x-7
= (30x^3+9x^2+32x-7) Answer
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5. A box in a supply room contains 15 compact fluorescent lightbulbs, of which 5 are rated 13-watt, 6 are rated 18-watt, and 4 a
skelet666 [1.2K]

Answer:

176/1125 or 0.156

Step-by-step explanation:

There are 15 bulbs, of which 4 are 23-watt. The probability of selecting a 23-watt bulb = 4/15. If we call this probability x, then x = 4/15.

The probability of selecting a 13-watt or 18-watt bulb is the probability of not selecting a 23-watt bulb. If we call this y, y = (6+5)/15 = 11/15. It follows that x and y are mutually exclusive. Here, we have a binomial distribution.

The number of ways of selecting exactly two 23-watt bulbs out of three is

\binom{3}{2} = 3

The probability of selecting them is

3x^2y = 3\times\left(\dfrac{4}{15}\right)^2\times\dfrac{11}{15}=\dfrac{176}{1125}= 0.156

3 0
3 years ago
In a democracy,
ruslelena [56]
C. Is the answer I believe. At least in Canada. That’s why we have the senate here. To listen to the majority while still protecting minority rights
3 0
3 years ago
Can someone answer this please
Roman55 [17]

Answer:

<COB = 50°

Step-by-step explanation:

We can say that m<AOC + m<COD + m<DOB = 180° because the three mentioned angles form a straight line. We can substitute to get:

3x + 94 + x + 18 + 2x - 4 = 180

Then, we can combine like terms:

6x + 108 = 180

6x = 72

x = 12

We can see that m<COB is the sum of m<COD and m<DOB. We can wrote an equation to model the situation:

m<COB = m<COD + m<DOB

m<COB = x + 18 + 2x - 4

m<COB = 3x + 14

We have the value of x, so we can substitute that in:

<COB = 3(12) + 14

<COB = 36 + 14

<COB = 50°

4 0
3 years ago
Take these 25 pts my apologies
Leno4ka [110]

Answer:

ok

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Solve for x: 7x-3/2 = -2/3​
GuDViN [60]

Hence, the value of x ix 5/21.

<h3><u>★ Solution (1) :-</u></h3>

\sf \leadsto \dfrac{7x - 3}{2} = \dfrac{-2}{3}

\sf \leadsto 3(7x - 3) = -2(2)

\sf \leadsto 21x - 9 = -4

\sf \leadsto 21x = -4 + 9

\sf \leadsto 21x = 5

\sf \leadsto x = \dfrac{5}{21}

6 0
2 years ago
Read 2 more answers
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