X−3y+4z=−4 2x−9y+11z=−20 x−2y+3z=0

1. Simplify the expression: 4w3z4 + 3w3 + 4z4 + 2w3z4 + z

Mrac [35]

Answer:72wz+17z+9w

Step-by-step explanation:

You multiply them together them add to simplify them.

8 0

3 years ago

PRE-ACTIVITIES/PRE-TEST

MrRissso [65]

Answer:

Step-by-step explanation:

★1. The farmers' crops are destroyed when there are heavy rains which

result to flooding.

★2. Loss of lives and damage to properties happen due to fiooding and

landslides

★3. Thousands of families become homeless.

•4. Fishermen can go fishing and abundant catch awaits them.

★5. The power supply is cut off for several days as falling trees destroy the

electric posts and power lines.

★6. People lose their homes and means of livelihood.

•7. The prices of basic commodities become cheaper.

•8. People visit malls for shopping.

•9. A few houses of first-class materials are partially damaged,

•10. Children play on the playground.

5 0

3 years ago

How do I prove that 2 cot 2x = cot x-tan x?

BlackZzzverrR [31]

We will start off working on the right hand side.
cot x - tan x 
= [cos x / sin x] - [sin x / cos x] 
= [(cos x)^ 2 - (sin x)^2] / [sin x cos x] 

This is where it gets a bit tougher if you do not have your formula list with you. 
(cos x)^ 2 - (sin x)^2 = cos(2x) 
sin 2x = 2 sin x cos x 

Note that by arranging the second formula, we will have sin x cos x = (1/2) sin 2x 

Hence, we will get: 
[(cos x)^ 2 - (sin x)^2] / [sin x cos x] 
= [cos 2x] / (1/2)[sin 2x] 
= 2[cos 2x] / [sin 2x] 
= 2cot 2x

7 0

3 years ago

sixty more than nine times a number is the same as two less than ten times the number. what is the number

Leokris [45]

Answer:

130

Step-by-step explanation:

6 0

3 years ago

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PLEASE HELP! BRAINLIEST!!!!!!! PLEASE

Gnesinka [82]

Hello!

First you have to find the volume of the cylinder

To find the volume of a cylinder you use the equation

$V = \pi r^{2} h$

V is volume
r is radius
h is height

Put in the values you know and 3.14 for pi

$V = 3.14 * 3^{2} * 7$

Square the number

V = 3.14 * 9 * 7

Multiply

V = 197.82
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Next you find the volume of the sphere

To find the volume of a sphere you use the equation

$V = \frac{4}{3} \pi r^{3}$

V is volume
r is radius

Put in the values you know and 3.14 for pi

$V = \frac{4}{3} * 3.14 * 3^{3}$

Cube the number

$V = \frac{4}{3} * 3.14 * 27$

Multiply

V = 113.04
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Finally you subtract the two volumes from each other

197.82 - 113.04 = 84.78
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The answer is C)84.78

Hope this helps!

7 0

3 years ago

Read 2 more answers