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lesantik [10]
3 years ago
9

I dont understand please help

Mathematics
1 answer:
DiKsa [7]3 years ago
3 0

2 \frac{1}{2}+(-2\frac{1}{4})

This is equal to:

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

When you add a negative number, it turns into subtraction.

First, I would change it to mixed numbers:

\frac{5}{2}-\frac{9}{4}

Now, you need to change the denominators to make sure they are the same on both fractions. I changed the first fraction's denominator to 4 so they match. You can do this by multiplying the numerator by 2:

\frac{10}{4}-\frac{9}{4}

Now, you simply subtract:

10-9=1

1/4 is your answer.

I hope this helps :)

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A is (-2,1)
valkas [14]

1) in order to solve this problem you must to obtain The value of K,  for it you know by definition  that the  horizontal slope  of the side BC  is zero ,

then m = Y2-Y/X2-X1,   0 = 5-K/4-6⇒0 = 5-K⇒K = 5

known this value for K   you ca find the equation of thE line that pass through  A and C

2) Following the same procedure in first place you calculate the slope with the points A(-2,1) Y C ( 4,5)

m= 5-1/4-(-2) = 2

now with any point  A  or C and the slope you obtain the line

A(-2,1)

y-y1 = m (x-x1) ,   Y-1= 2(X-(-2)⇒Y-1= 2X+4⇒Y=2X+4-1⇒Y =2X+3


7 0
3 years ago
In one town, 47% of all voters are Democrats. If three
34kurt

Answer:

The  probability that the all three votes are  Democrats

P(X=3) = 0.1038

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given that the all voters are democrats

The probability that the all voters are democrats

p = 47% =0.47

q = 1-p =1-0.47 = 0.53

<u><em>Step(ii):-</em></u>

Let 'X' be the random variable in binomial distribution

P(X=r) = n_{C_{r} } p^{r} q^{n-r}

The  probability that the all three votes are  Democrats

P(X=3) = 0.1038

n=3 and r=3

P(X=3) = 3_{C_{3} } (0.47)^{3} (0.53)^{3-3}

P(X=3) = 1 (0.47)^{3}

P(X=3) = 0.1038

<u>Final answer:-</u>

The  probability that the all three votes are  Democrats

P(X=3) = 0.1038

<u></u>

5 0
3 years ago
Which expression is equivalent to (3−22)+5?
Assoli18 [71]

Answer:

b 2 to the second -5

Step-by-step explanation:

3 0
3 years ago
The difference of the square of a number and 5 is equal to 4 times that number. Find the negative solution
Bezzdna [24]

Answer:

x = - 3

Step-by-step explanation:

x² - 5 = 4

x² = 4 + 5

x² = 9

x = ± 3

the negative solution

x = - 3

4 0
3 years ago
Write the expression the sum of 13 and a number
labwork [276]

Answer:

13+2h

Step-by-step explanation:

The word "sum" can  be related to "addition" and "13 and a number" is just "13" and an exponent.

7 0
3 years ago
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