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fredd [130]
4 years ago
9

Practice writing equations from sentences. Assignment Which sentences describe the relationship between an expression and an equ

ation? Select all that apply.
An equation contains variables; an expression never does.
An equation contains an equal sign; an expression does not.
Both expressions and equations contain numbers and/or variables.
An expression has addition and subtraction; an equation never does.
An expression involves multiplication, but equations only use addition.​
Mathematics
1 answer:
Lunna [17]4 years ago
3 0

Answer:

An equation contains an equal sign; an expression does not.

Both expressions and equations contain numbers and/or variables

Step-by-step explanation:

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A 4-digit PIN number is selected. What it the probability that there are no repeated digits?
geniusboy [140]

Answer:

P(A)=0.504 or 50.4%

Step-by-step explanation:

The <em>probabilities</em> constitute a branch of mathematics that deals with measuring or quantitatively determining the possibility that an event or experiment produces a certain result. The probability is based on the study of combinatorics and is the necessary foundation of statistics.

A <em>permutation</em> is an ordered arrangement of objects in a group, without repetitions.

A 4-digit PIN is selected. What is the probability that there are no repeated digits?

First, there are only 10 possible values for each digit of the PIN (0, 1, 2, 3, 4, 5, 6, 7, 8, 9). The total possibles 4 PINs are 10^{4} =10000

There's no repeated numbers and all the four numbers have to be different, which means we have to select 4 numbers out of 10 numbers. Using the permutation equation nP_{k} =\frac{n!}{(n-k)!}

10P_{4} =\frac{10!}{(10-4)!}=10.9.8.7.6= 5040

So, the probability that there are no repeated digits is:

P(A)=favorable cases/possible cases

P(A)=\frac{5040}{10000}=0.504 or 50.4%

.

5 0
4 years ago
What is the slope of the line through (-5,-10)(−5,−10)
Hitman42 [59]

Answer:theyre the exact same number, so it cant be told

Step-by-step explanation:

5 0
3 years ago
F(x) = x + 2<br> g(x) = 3x^2 – 5<br> Find (f • g)(x).
Yakvenalex [24]

Answer: 3x^3+6x^2-5x-10

Step-by-step explanation:

\left(x+2\right)\left(3x^2-5\right)

x\cdot \:3x^2+x\left(-5\right)+2\cdot \:3x^2+2\left(-5\right)

=3x^3+6x^2-5x-10

7 0
3 years ago
What is the slope of the line that passes through the points (-3, 5) and (1, 7)?
Stells [14]

Answer: The slope of the line is \frac{1}{2}

Step-by-step explanation:

The slope of a line can be calculated with the following formula:

m=\frac{y_2-y_1}{x_2-x_1}

Then, given the points (-3, 5) and (1, 7), you can identify that:

y_2=5\\y_1=7\\\\x_2=-3\\x_1=1

Knowing these values you can substitute them into the formula for calculate the slope:

m=\frac{5-7}{-3-1}

Finally, evaluating, you get that the slope of that line is:

m=\frac{-2}{-4}\\\\m=\frac{1}{2}

8 0
4 years ago
What's 6 3/4 × 3 4/5
tankabanditka [31]
6 \frac{3}{4} *3 \frac{4}{5} is equal to 25.65 or 25 \frac{13}{20} or even \frac{513}{20}
6 0
4 years ago
Read 2 more answers
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