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3 years ago

Use the Distributive Property to expand this expression. z(–6.4 – 3.5x)

Mathematics

1 answer:

deff fn [24]3 years ago

6 0

Answer:

-6.4z -3.5xz

Step-by-step explanation:

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A plane flight to Washington D.C costs $200 give or take $50. A plane flight to China costs $1,250 give or take $50. Which plane

kakasveta [241]

Answer:

The DC flight

Step-by-step explanation:

A fixed amount ($50) is always a larger fraction of a smaller number. It is a larger fraction of $200 than of $1250. The plane flight to Washington DC is affected relatively more by a variation of $50.

A price change of $50 on a base price of $200 is a percentage change of 25%. 50/200 × 100% = 25%

A price change of $50 on a base price of $1250 is a percentage change of about 4%. 50/1250 × 100% = 4%

4 0

4 years ago

Define a new random variable by y = 2px. show that, as p l 0, the mgf of y converges to that of a chi squared random variable wi

Mandarinka [93]

The moment generating function (mgf) of y is given by

$M_y(t)=E(e^{ty})=E(e^{2pxt})=M_x(2pt)=p(1-e^{2pt}(1-p))^{-1}$

Since the momoent generating function of x is given by $M_x(t)=p(1-e^{t}(1-p))^{-1}$

When p tends to 0, we have

$\lim_{p \to 0} M_y(t)= \lim_{p \to 0} \frac{p}{1-e^{2pt}(1-p)} = \frac{0}{0}$

Applying L'Hopital's rule we have:

$\lim_{p \to 0} M_y(t)=\lim_{p \to 0} \frac{1}{e^{2pt}+2te^{2pt}+2pte^{2pt}} = \frac{1}{1+2t} , \ \ \ t\ \textless \ \frac{1}{2}$

This shows that y converges to <span>a chi squared random variable with 2r degrees of freedom</span>.

5 0

4 years ago

3/4 3/5 2/3 greatest to least<br> ASAP PLEASE

Artist 52 [7]

2/3 3/4 3/5!!! Is the answer

4 0

3 years ago

X and y-intercept of y=X-5

aksik [14]

The x-intercept is when y = 0
y = x - 5 → 0 = x - 5 → x = 5

The y-intercept is when x = 0
y = x - 5 → y = 0 - 5 → y = - 5

Answer: x-intercept is (5, 0), y-intercept is (0, -5)

4 0

3 years ago

The local deli charges a fee for delivery. On monday, they delivered two dozen bagels to an office at a local cost of $8. On Tue

aev [14]

Answer:

2b+f=8; 3b+f=11
b=3, f=2

Step-by-step explanation:

The problem statement defines the variables and gives the relations ...

2b + f = 8 . . . . total cost on Monday

3b + f = 11 . . . . total cost on Tuesday

Subtracting the first equation from the second, we get ...

(3b +f) -(2b +f) = 11 -8

b = 3 . . . . . simplify

Substituting this into the first equation, we can solve for f

2·3 +f = 8

f = 2 . . . . . . . subtract 6

Bagels cost $3 per dozen; the delivery fee is $2.

4 0

3 years ago