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Elenna [48]
3 years ago
6

1+2+3+4+5+6.......+99 what is the quickest way to find the answer Thank u

Mathematics
2 answers:
Furkat [3]3 years ago
8 0

1+2+3+4+5+6+\ldots+99=\\(1+99)+(2+98)+\ldots+(49+51)+50=\\49\cdot100+50=\\4950

serious [3.7K]3 years ago
3 0

Answer:

Step-by-step explanation:

Use the formula Sum = (a + L)*n/2

The tricky part is n. That's the number of terms between 1 and 99 inclusive.

n = 99 -1 + 1 = 99

n = 99

a = 1

L = 99

Sum = (1 + 99)*99 / 2

Sum = (100)*99/2

Sum = 4950

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50 POINTS please help me I really need it
Mars2501 [29]

A Domain is the lowest and highest x value (-5,-2) is how it is formatted this means -5 to -2

Range is the lowest to highest Y value so (-3,3)

(-5,-2) - domain

(-3,3) - range

B Intercept are when the line crosses the acis labeled x so

(-2,0) and (2,0)

C F(1) means what is x when y is equal to 1 so we must estimate this

(-1,1) and (1.5,1)

D f(x) = -3 is when y is -3 so we look at the graph to see

-5 and 4 are the values for x

E f(x) < 0 means when y is above the x axis

This is between the x values of -2 and 2 or (-2,2)


7 0
3 years ago
help finding the perimter of 78.4 inches whats the length of each side and show me how to work the promblem
LuckyWell [14K]
A square has four even sides and the perimeter is equal to the sum of all of the sides.
P=s+s+s+s=4s
So we can evaluate the equation for P and then solve for s.
78.4=4s \\  \frac{78.4}{4} =s \\ s=19.6in
6 0
3 years ago
Write the product in standard form (2x + 5) ^2
Iteru [2.4K]

Answer:

4x^2+20x+25

Step-by-step explanation:

(2x+5)^2 = (2x+5) (2x+5)

Using the foil method : 2x(2x) = 4x^2

(2x) (5) = 10x

(2x) (5) = 10x

5 (5) = 25

Combine like terms

4 0
3 years ago
what formulas could be used to determine the surface area of a cylinder sandwiched between one cone and half of a sphere?
skelet666 [1.2K]
Answer: Rectangle around the cylinder, Lateral surface of the cone, Half a sphere

To find this surface area, you have 3 different parts. First, you need the rectangular portion of the cylinder, because the circles will be on the inside of the composite shape. Then, you will need the lateral side of the cone, that's everything but the circular base. Again, the circle will be on the interior. Finally, you should find the surface area of half of the sphere.
4 0
3 years ago
Evaluate the expression when n= -2<br> 5n+30
sammy [17]

Answer:

20

Step-by-step explanation:

5(-2)+30 = (-10)+30 = 20

6 0
3 years ago
Read 2 more answers
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