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3 years ago

7(9b)x78 what does this mean

1 answer:

3 0

Basically 7(9b) is just multiplication so you get 63b times 78. You can't simplify it further cause you don't know what b is.

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WILL BRAINLEIST IF CORRECT!!!!!!

11Alexandr11 [23.1K]

Answer: -2

Different in Squares: a^2 −b^2 =(a+b)(a−b)

Rad 7^2-3^2 —> Rad 7^2=7 and -3^2= -9

—> 7-9= -2

3 0

3 years ago

About 1/4 of all adults in the United States have type O+ blood. If three randomly selected adults donate blood, find the probab

valina [46]

Answer:

a) 0.0156

b) 0.4219

c) 0.1406

Step-by-step explanation:

We are given the following information:

We treat adult having type O+ blood as a success.

P(Adult have type O+ blood) = 0.25

Then the number of adults follows a binomial distribution, where

$P(X=x) = \binom{n}{x}.p^x.(1-p)^{n-x}$

where n is the total number of observations, x is the number of success, p is the probability of success.

Now, we are given n = 3

a) All three are type O+

$P(x =3)\\= \binom{3}{3}(0.25)^3(1-0.25)^0\\= 0.0156$

b) None of them is type O+

$P(x =0)\\= \binom{3}{0}(0.25)^0(1-0.25)^3\\= 0.4219$

c) Two out of the three are type O

$P(x =2)\\= \binom{3}{2}(0.25)^2(1-0.25)^1\\= 0.1406$

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2 years ago

50 POINTS

Tasya [4]

Hello,

The answer is

<span>B. Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right

Hope this helps</span>

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2 years ago

If you want to leave a 20% tip and the total bill was $87.37, What is the price of the bill including the tip? :D

Harrizon [31]

Answer: $105.84

Step-by-step explanation:

20/100 = x/87.37

*cross multiply*

20*87.37 = 100x

1747.4 = 100x

*divide*

1747.4/100 = x

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*add*

87.37 + 17.474

105.844

*round*

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2 years ago

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morpeh [17]

Answer:
Send a picture so I can understand

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2 years ago