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oee [108]
2 years ago
8

Evaluate −x^2−5 y^3 when x = 4 and y = 1

Mathematics
2 answers:
Natali [406]2 years ago
4 0

Answer:

Simplify:

-4^2-5(1^3)

So you get:

-21\\

Papessa [141]2 years ago
4 0

Answer:

\huge\boxed{-21}

Step-by-step explanation:

-x²-5y³

Given that x = 4, y = 1

-(4)^2-5(1)^3

-16-5(1)\\-16-5\\-21

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What is the variance of 4,7,5,9? how do i find the answer?​
kumpel [21]

See attachment for math work and answer.

6 0
3 years ago
4. Is rap music more popular among young Indians than among young Asians? A sample survey compared 634 randomly chosen Indians a
bulgar [2K]

Answer:

H0 is accepted

there is no difference between the proportions of Indian and Asian young people who listen to rap music every day.

Step-by-step explanation:

Given  a sample survey compared 634 randomly chosen Indians aged 15 to 25 with 567 randomly selected Asians in the same age group.

p_{1} = \frac{368}{634} =0.580

It found that 368 of the Indians and 130 Asians listened to rap music every day.

p_{2} = \frac{130}{567} =0.229

Null hypothesis H0: there is no difference between the proportions of Indian and Asian young people who listen to rap every day.

p_{1} = p_{2}

Alternative hypothesis:- p_{1} \neq  p_{2}

Level of significance α = 0.05

The test of statistic

z = \frac{p_{1} -  p_{2}}{\sqrt{pq(\frac{1}{n_{1} }+\frac{1}{n_{2} })  } } }

where p = \frac{n_{1}p_{1} + n_{1}p_{2}}{n_{1}+n_{2}} = \frac{634(0.580)+567(0.229)}{634+567}

       p = 0.414

and q = 1-p = 1- 0.414 =0.586

Z = \frac{0.580-0.229}{\sqrt{0.414(0.586)(\frac{1}{634} +\frac{1}{567} } } }

on calculation , we get

z = 0.300 ><1.96 at 95 % level of significance

H0 is accepted

there is no difference between the proportions of Indian and Asian young people who listen to rap every day.

3 0
3 years ago
Arun’s restaurant bill is $58, and he wants to leave the waiter an 18 percent tip. What will Arun’s total bill be?
Natalka [10]

Answer:

68.44

Step-by-step explanation:


6 0
3 years ago
Read 2 more answers
If f(x)=-3x-2, find f(-2)+9
mash [69]

Answer:

13

Step-by-step explanation:

Replace the variable x with -2 in the expression.

f (-2) = -3 x -2 -2

Simplify (-3 x -2 -2) + 9

Multiply -3 by -2

6 - 2 + 9

Subtract 2 from 6

4 + 9

add 4 and 9

13.

4 0
2 years ago
Pls help me and thank you!
Rudik [331]
Answer : -3/4 ..............

6 0
3 years ago
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