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irina1246 [14]
3 years ago
14

Given u = −5i + 2j, v = −6i + 4j, find −2u + 2v

Mathematics
1 answer:
Burka [1]3 years ago
4 0

Answer:

\huge\boxed{-2i+4j}

Step-by-step explanation:

u=-5i+2j\\\\v=-6i+4j\\\\-2u+2v=-2(-5i+2j)+2(-6i+4j)\\\\\text{use the distributive property}\\\\=(-2)(-5i)+(-2)(2j)+(2)(-6i)+(2)(4j)\\\\=10i-4j-12i+8j\\\\\text{combine like terms}\\\\=(10i-12i)+(-4j+8j)\\\\=-2i+4j

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If x=3 y=4 z=6 then 4x+8yz+3y equals
guapka [62]

Answer:

216

Step-by-step explanation:

4x+8yz+3y

Let x=3 y=4 z=6

Substitute the values into the expression

4(3)+8(4)(6)+3(4)

Multiply first

12+192+12

Then add

216

5 0
2 years ago
Jake is buying a sweater with the price of 30 dollars the store is having a sell that will reduce the price by 30%. Sales tax of
shusha [124]

Answer:Jake's total cost is $22.05

Step-by-step explanation:

The initial price of the sweater is $30. The store is having a sell that will reduce the price by 30%. This means that there is a reduction in the original amount of the sweater by 30% which is expressed as

30/100 × 30 = $9

The new price of the sweater would be 30 - 9 = $21

Since a sales tax of 5% will be added to the final purchase price, the value of the tax would be

5/100 × 21 = 0.05×21 = $1.05

Jake's total cost would be

21 + 1.05 = $22.05

7 0
3 years ago
Find the value of x, y, and z in the figure below:<br> ہ<br> 2y<br> IN<br> 2x<br> 90°<br> t
natima [27]

Answer:

x=30°

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Step-by-step explanation:

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2y=x

y= 30/2

y=15°

2y°+z°=180°

2(15°)+z°=180°

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z=150°

Hope it helps! :)

6 0
2 years ago
I will give brainliest!!!!!!!!!
sergiy2304 [10]
15
If it’s not message me I’ll give u the answer
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3 years ago
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