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3 years ago

11

What is the surface area of a square pyramid that has a base of 100 feet squared a base perimeter of 40 feet a height of 50 feet

and a slant height of 60 feet

1 answer:

g100num [7]3 years ago

3 0

The surface area of the square It’s 1,300ft

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Given the Arithmetic series A1+A2+A3+A4 A 1 + A 2 + A 3 + A 4 8 + 11 + 14 + 17 + . . . + 68 What is the value of sum?

wolverine [178]

Because 17 - 14 = 14 - 11 = 3, the ratio of the arithmetic series is 3;

Then, A4 = 8 - 3 = 5; A3 = 5 - 3 = 2; A2 = 2 - 3 = -1; A1 = -1 - 3 = -4.

But 68 = A1 + ( n- 1 ) x r;

68 = -4 + ( n - 1) x 3;

( n - 1 ) x 3 = 72;

n - 1 = 24;

n = 25;

Finally, Sn = ( A1 + An) x n / 2; then, S25 = ( - 4 + 68) x 25/2;

S25 = 64 x 25 / 2;

S25 = 32 x 25;

S25 = 800;

The value of sum is 800.

8 0

3 years ago

Read 2 more answers

Find<br>a,b<br>such<br>that 7.2, a, b, 3 are in A.P.

leonid [27]

Answer:

The value of a = 5.8

The value of b = 4.4

Step-by-step explanation:

Given

7.2, a, b, 3 are in A.P

$2a = 7.2+b$

$b = 2a - 7.2$

as

a, b, 3 are also in A.P

$2b\:=\:a\:+\:3$

Putting $b = 2a - 7.2$

$2\left(2a-7.2\right)=a+3$

$4a-14.4=a+3$

$\mathrm{Add\:}14.4\mathrm{\:to\:both\:sides}$

$4a-14.4+14.4=a+3+14.4$

$4a=a+17.4$

$4a-a=a+17.4-a$

$3a=17.4$

$\mathrm{Divide\:both\:sides\:by\:}3$

$\frac{3a}{3}=\frac{17.4}{3}$

$a=5.8$

Now, plugging $a=5.8$ in $b = 2a - 7.2$

$b=2\left(5.8\right)-7.2$

$b=2\cdot \:5.8-7.2$

$b=11.6-7.2$

$b=4.4$

Therefore,

The value of a = 5.8

The value of b = 4.4

4 0

3 years ago

Order the numbers from least to greatest: -3, 5, -1, 0, 7

Reika [66]

-3, -1, 0, 5, 7 ......... hope this helps

7 0

3 years ago

Read 2 more answers

*pls help* <br> solve 7,8,9, and 10 for brainliest

ivanzaharov [21]

Answer:

#8 : x=15−y

#9: $\frac{c}{b} -\frac{ax}{b}$

#10: y=2A−x

#7: T= $\frac{P}{IR}$

Step-by-step explanation:

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2 years ago

An orange has about 1/4 cup of juice. How many oranges are needed to make 2 1/2 cups of juice?

Vesna [10]

Answer:

10 oranges

Step-by-step explanation:

4 oranges are needed to make one cup. 2 cups is 8 oranges and 1/2 cup is 2 oranges

8 0

3 years ago