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3 years ago

Answer A and B. I will give the brainliest to the best answer.

Mathematics

2 answers:

Alexxandr [17]3 years ago

5 0

Answer:

a) 267 b) 445

Step-by-step explanation:

BlackZzzverrR [31]3 years ago

5 0

Answer:

A) 267 fruit flies had red eyes.

B) 445 fruit flies did not have red eyes.

Step-by-step explanation:

First, you find 3/8 of 712, which was 267. Then, you subtract the 712 by 267: 712-267=445. Which shows 445 fruit flies did not have red eyes.

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It is believed that 43% of the US population can play the piano, 28% can play the guitar, 15% can play the harmonica, 12% can pl

melomori [17]

Answer:

The smallest sample size to satisfy the conditions is n=500.

Step-by-step explanation:

The condition for performing the inference related to the sample size is that, for all the categories, the expected success and failures in the sample are at least 10:

$np\geq10\\\\n(1-p)\geq10$

The largest sample size required will be for the minimum p or (1-p).

This happens to be the proportion that can play other instruments: 2%.

Then, we can calculate the minimum sample size as:

$np\geq10\\\\n(0.02)\geq10\\\\n\geq(10/0.02)\\\\n\geq500$

6 0

3 years ago

I need help on what to do for part b

Nataliya [291]

The answer would be 1008. 24x42

5 0

3 years ago

What are the zeros of the quadratic function f(x)=2x^2+16x-9

san4es73 [151]

Answer:

Step-by-step explanation:

The quadratic formula is

$x=\frac{-b+\sqrt{b^2-4ac} }{2a}$ .

It is important because while some quadratics are factorable and can be solved not all are. The formula will solve all quadratic equations and can also give both real and imaginary solutions. Using the formula will require less work than finding the factors if factorable. We will substitute a=2, b=16 and c=-9.

$x=\frac{-b+/-\sqrt{b^2-4ac} }{2a}\\x=\frac{-(16)+/-\sqrt{(16)^2-4(2)(-9)} }{2(2)}\\x=\frac{-16+/-\sqrt{256+72} }{4}$

We will now simplify and solve.

$x=\frac{-16+/-\sqrt{328}}{4}\\x=-4+/-\sqrt{\frac{328}{16}}\\x=-4+/-\sqrt{\frac{41*8}{2*8}}\\x=-4+/-\sqrt{\frac{41}{2}}$

8 0

3 years ago

What is the rate and unit rate for 360 customers in 30 days

Mamont248 [21]

I think it is 380 but I am not sure

6 0

3 years ago

Tim earns $125/week plus $12.50 for each desk he assembles. Write an inequality to represent how many desks he needs assemble to

Ainat [17]

D=26

He already makes 125 a week and you have to take it away because the goal is to get 450 in total

450-125=325

Than you divide it by $12.50 to see how many in total you have to make that will get you to 450

325/12.50=26

so tim has to make 26 desk

d=26.

4 0

3 years ago