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3 years ago

PLZ HELP!! 39+(-20.4) When you answer can you plz show how you got the answer plz!!

2 answers:

7 0

It will be +18.6
Because (-20.4) is a negative number
Imagine a number line you would need 20.4 to get back to 0 since you will start at negative 20.4
39-20.4 is 18.6
So you have 18.6 left which will be on the positive side so that’s the answer

ZanzabumX [31]3 years ago

5 0

Answer:

i think is 18.6 I not sure

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A researcher wishes to conduct a study of the color preferences of new car buyers. suppose that 50% of this population prefers t

djyliett [7]

To solve this question, use the Binomial probability formula.

The formula is given by

$^nC_xp^x(1-p)^{n-x}$

Where:

n = the number of trials

x = the sample we aim to try

p = the probability of success

In this question:

n = 16

x = 9

p = 0.5

Substituting in the equation:

$\begin{gathered} ^nC_xp^x(1-p)^{n-x} \\ ^{16}C_9*0.5^9(1-0.5)^{16-9} \\ \end{gathered}$

And the combination formula:

$^nC_x=\frac{n!}{(n-x)!*x!}$

Then:

$\begin{gathered} \frac{16!}{(16-9)!*9!}*0.5^9(1-0.5)^{16-9} \\ \frac{16!}{7!*9!}*0.5^9*0.5^7 \\ 11440*0.00195*0.0078 \\ =0.1746 \end{gathered}$

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6 0

1 year ago

The potential solutions to the radical equation are a = −4 and a = −1. Which statement is true about these solutions? The soluti

inessss [21]

Answer:

Both a = −4 and a = −1 are true solutions

Step-by-step explanation:

Given

$\sqrt{a + 5} = a + 3$

$a = -4; a = -1$

Required

The true statement about the solutions

We have:

$\sqrt{a + 5} = a + 3$

Square both sides

$a + 5 = (a + 3)^2$

$a + 5 =a^2 + 6a + 9$

Collect like terms

$a^2 + 6a - a + 9 - 5 = 0$

$a^2 + 5a + 4 = 0$

Expand

$a^2 + 4a + a + 4 = 0$

Factorize

$a(a + 4) + 1(a + 4) = 0$

Factor out a + 4

$(a + 1)(a + 4) = 0$

Split:

$a + 1 = 0; a + 4 = 0$

Solve:

$a =-1; a = -4$

8 0

3 years ago