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Kipish [7]
3 years ago
12

What is -5(2x + y - 4)

Mathematics
1 answer:
Dafna11 [192]3 years ago
5 0

Answer: -10x-5y+20

Step-by-step explanation:

Multiply each term in the parenthesis by -5:

-10x-5y+20

-5*2x-5y-5*(-4)

Calculate the Product:

-5*2x-5y-5*(-4)

-10x-5y-5*(-4)

Solution:

-10x-5y+20

Please mark brainliest if this helped you :)

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Marie is bringing bagels and cream cheese to school as a birthday snack for her class. The cost of b bagels and c packages of cr
emmasim [6.3K]

Answer:

$30.50

Step-by-step explanation:

b = bagels

c = cream cheese

<u>Given</u>

b = 30

c = 2

<u>Work:</u>

0.85b+2.5c

0.85(30) + 2.5(2)

25.5 + 5

30.5

4 0
3 years ago
A vendor converts the weights on the packages she sends out from pounds to kilograms (1kg approximately equals 2.2 pounds).
Alexxx [7]

Answer:

a) b) the standard deviation and the mean is affected by the conversion factor as well

c)  the mean is displaced by b units

Step-by-step explanation:

for a new variable

Y=a*X  , where a= constant (conversion factor= 1 kg/2.2 pounds)

then

p(y)= p(a*X) = p(X)

a) mean =μ=E(Y)= ∑ a*X*p(y) = a ∑ X*p(x) = a* E(X)

mean =μ=a*μₓ

b) σ² = ∑ (Y-μ)²* p(y) =  ∑ (a*X-a μₓ)²* p(y) = a²*∑ (X-μₓ)²* p(x) = a²*σₓ²

then

standard deviation = σ= √σ²=√(a²*σₓ²) = a*σₓ

standard deviation = σ= a*σₓ

then the standard deviation and the mean is affected by the conversion factor as well

c) nevertheless for a displacement b

Y₂=X + b (b= constant= 50 gr)

p(Y₂)= p(X + b) = p(X)

then

mean =μ=∑ (X-b)*p(y)=∑ X*p(x)- b ∑ p(x) = E(X) -

mean =μ=μₓ - b

then the mean is displaced by b units

7 0
3 years ago
HELP QUICK PLEASE!!
Ksenya-84 [330]

Answer:

2

it is very clear and understandable

7 0
3 years ago
You made some snacks for a party. You have 24 cheese snacks, 18 yogurt snacks, and 32 vegetable snacks. Total number of snacks.
Papessa [141]
The answer is 74 snacks.
24+32 =56
56+18=74
3 0
3 years ago
Read 2 more answers
If tan a = 9/40<br>use trigonometric identities to find the values of sin a and cos a.​
Sindrei [870]

Answer:

see explanation

Step-by-step explanation:

Given

tan a = \frac{9}{40} = \frac{opposite}{adjacent}

We require the hypotenuse h

Using Pythagoras' identity

h² = 9² + 40² = 81 + 1600 = 1681 ( take square root of both sides )

h = \sqrt{1681} = 41 , thus

sin a = \frac{opposite}{hypotenuse} = \frac{9}{41}

cos a = \frac{adjacent}{hypotenuse} = \frac{40}{41}

4 0
3 years ago
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