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irina [24]
1 year ago
6

I'm lazy and dont feel like doing math myself. So pls help me!

Mathematics
1 answer:
vodomira [7]1 year ago
6 0

Answer:

55

Step-by-step explanation:

\frac{n(n + 1)}{2}  \\ n = 10 \\ substitutig \\  \frac{10(10 + 1)}{2} \\ \\   \frac{10(11)}{2} \\  \\  \frac{110}{2}  = 55

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The coordinates of P and Q are (2,6) and (4,5) respectively. Equation of a line RS is Y= 2X -3. Determine if the lines are paral
Travka [436]

Answer:

Perpendicular

Step-by-step explanation:

Given points P=(2,6) and Q=(4,5)

The line RS is y=2x-3.

Now we know that the line joining any two points (x1,y1) and (x2,y2) has slope m=\frac{y2-y1}{x2-x1}

Now the slope of the line PQ is

m1=\frac{5-6}{4-2}= -\frac{1}{2}

We know that  the slope of the line in the form y=mx+c is m

So the line RS has slope m2=2

Now two lines are parallel if m1=m2

And those two lines are perpendicular if m1*m2=-1

here m1= -\frac{1}{2}    and m2=2

clearly m1*m2=-1

Therefore the two given lines are perpendicular

7 0
3 years ago
Answer this questions for 40 points! :) it is attached.
telo118 [61]
Im so confused by this question but my only guess would be that since a coin is a 1/2 chance getting it heads twice is 1/2 * 1/2 which is 1/4 so the person who best they can get 2 heads in a row pays 1/4 of the bet being 5 dollars because 1/4 of 20 is 5 and the person who bets that they can't get two heads pays 15 dollars because that is 3/4 of the bet

tldr: 1/4 chance to get heads pays 1/4 of bet 5$
3/4 chance not to get heads pays 3/4 of bet 15$
5 0
3 years ago
Read 2 more answers
Evaluate.<br> 25/5+7-(4x3)
navik [9.2K]
Using PEMDAS, we know that we must solve what’s in the perentheses first so: 25/5 + 7 - (4x3) = 25/5 + 7-12. Next, we simplify 25/5 because that is division so now it is 5+7-12. Now you add 7 to 5 to get 12 and then subtract 12 so your answer is now zero.
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2 years ago
Solve for me please this is trigonometry
Vladimir79 [104]

Answer:

x= 23.4

Step-by-step explanation:

In a right triangle the tangent of an angle is the ratio of the opposite length over the adjacent*. In formulas, tan 54° = x/17 Solving for x, using a calculator for the tangent, x= 23.4

*I promise I didn't just spellcheck that.

3 0
2 years ago
In a relay race, Nancy ran her part in 15.25 seconds, John ran his part in 13.8 seconds, Sylas ran his part in 16.4 seconds. Wha
sp2606 [1]

Answer:

45.45

Step-by-step explanation:

7 0
3 years ago
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