3 years ago

Please answer correctly !!!!!!! Will mark brainliest !!!!!!!!!!

Mathematics

1 answer:

astra-53 [7]3 years ago

6 0

Answer:

9 years.

Step-by-step explanation:

Make x the number of years passed.

$\frac{39+x}{3+x}=4$

12 + 4x = 39 + x

27 = 3x

x = 9

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A regular square pyramid has base edges of length 16 and its lateral faces are inclined 30° to the base of the pyramid. What is

Helga [31]

Answer:

1) $h=\frac{8\sqrt{3}}{3}\ units$

2) $V=\frac{2,048\sqrt{3}}{9}\ units^3$

Step-by-step explanation:

Part 1) Find the height of the pyramid

we know that

$tan(30^o)=\frac{h}{(b/2)}$

where

h is the height of the pyramid

b is the length side of the square base

we have

$tan(30^o)=\frac{\sqrt{3}}{3}$

$b=16\ units$

substitute

$\frac{\sqrt{3}}{3}=\frac{h}{(16/2)}$

$\frac{\sqrt{3}}{3}=\frac{h}{8}$

$h=\frac{8\sqrt{3}}{3}\ units$

Part 2) Find the volume of the pyramid

we know that

The volume of the pyramid is equal to

$V=\frac{1}{3} Bh$

where

B is the area of the square base

h is the height of the pyramid

we have

$B=(16^2)=256\ units^2$

$h=\frac{8\sqrt{3}}{3}\ units$

substitute

$V=\frac{1}{3} (256)(\frac{8\sqrt{3}}{3})$

$V=\frac{2,048\sqrt{3}}{9}\ units^3$

8 0

3 years ago

Simplify 8 - (-5) - 4(-7).

IgorC [24]

Answer:41

Step-by-step explanation:

8 - (-5) - 4(-7) = 8+5+4*7=13+28=41

7 0

3 years ago

Kala has scored 21,22,20,20 and 17 point in her five basketball game so far. How many points does she need to score in her next

Oliga [24]

Step 1: Add up all the scores.
Step 2: count the number of scores.
step 3: divide the sum of the scores by the number of scores themselves.
step 4: The answer is 26 points.

8 0

3 years ago

Rewrite in the simplest terms: 8k - 9(4k +4)

Assoli18 [71]

8k - 9(4k + 4) = 8k - 36k - 36 = -28k - 36

4 0

3 years ago

Read 2 more answers

Please help ASAP I’m really dumb, I’ll give u 5 stars, thank u, and make u brainliest ToT

Lina20 [59]

Usually I just use slope calculator hope that helps

3 0

3 years ago