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3 years ago

Hi! I need help with some math questions. Not problems though, I’ll show what I mean.

Mathematics

2 answers:

likoan [24]3 years ago

6 0

Answer:

Negative numbers are most important especially in the field of physics and chemistry. They help us in real life geometry and in almost everything. The discovery of the number system has changed the human civilization to such a great extent, that, without it, we can't even think of architectures and the nature's law(by calculus).

Dominantly, zero is the most ever used number and is very important to express anything.

Without it, you couldn't have the digital world (simply, no computers, no phones, no machines and no A.I.).

As we all know, Dr. Aryabhatta, the legendary guy, who made the no. '0', holds the credits!

I hope it will be useful.

natima [27]3 years ago

3 0

Answer:

Step-by-step explanation:

i think it is important to add a 0 to know where the numbers start

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Can somebody help me answer these plz?

Snezhnost [94]

number 2 would be 43

number 3 would be 40

5 0

3 years ago

A random sample of 144 recent donations at a certain blood bank reveals that 81 were type A blood. Does this suggest that the ac

Reptile [31]

Answer:

Null hypothesis: $p=0.4$

Alternative hypothesis: $p \neq 0.4$

$z=\frac{0.5625 -0.4}{\sqrt{\frac{0.4(1-0.4)}{144}}}=3.98$

$p_v =2*P(z>3.98)=0.0000689$

Since the p value is very low compared to the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true percent of people with type A of blood is significantly different from 0.4 or 40%

Step-by-step explanation:

Information given

n=144 represent the random sample taken

X=81 represent the number of people with type A blood

$\hat p=\frac{81}{144}=0.5625$ estimated proportion of people with type A blood

$p_o=0.4$ is the value that we want to verify

$\alpha=0.01$ represent the significance level

z would represent the statistic

$p_v{/tex} represent the p value Hypothesis to testWe want to test if the percentage of the population having type A blood is different from 40%.: Null hypothesis:[tex]p=0.4$

Alternative hypothesis: $p \neq 0.4$

the statistic is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

Replacing the info given we got:

$z=\frac{0.5625 -0.4}{\sqrt{\frac{0.4(1-0.4)}{144}}}=3.98$

Now we can calculate the p value with this probability taking in count the alternative hypothesis:

$p_v =2*P(z>3.98)=0.0000689$

3 0

3 years ago

i need someone to do 2 pages of easy percentage change only like 14 questions in total, easy way to get points

Oxana [17]

Answer:

1 question 5 points? I can help if it's this exchange rate xd I need another 258 points

3 0

3 years ago

Which weighs more: a watermelon that weighs 19.5 kilograms or a toddler that weighs 40 pounds?

AlladinOne [14]

Answer: watermelon

1 kg = 2.205 lb

(19.5)(2.205)=42.99 lb

7 0

3 years ago

Read 2 more answers

Pls help solve question 3

Lelu [443]

Answer:

If m is the midpoint of ab it means am is equal to mb

am = 3x + 8 and mb = 6x-4

and ab = am + mb

first find the value of x by using am = mb

3x + 8 = 6x - 4

8 + 4 = 6x - 3x

12 = 3x

x = 4

ab = 3 (4) + 8

= 12 + 8 = 20 = mb

ab = am + mb

= 20 + 20

so, the value of ab is 40

4 0

3 years ago