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3 years ago

P-please help (30 points)

Mathematics

1 answer:

liubo4ka [24]3 years ago

8 0

Answer:

No .1

Ans ; 2

No.2

Ans ; 3

Step-by-step explanation:

Multiply or add and if the value is whole no. then its W else L

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Two are used to fill the swimming pool.Pipe A alone fill the tank in 4 hours and pipe B fill the tank in 4 hours.If both pipe s

MrMuchimi

Answer:

The pipe A will fill the pool in 2.25 hours and the pipe B will fill the pool in 1.75 hours.

Step-by-step explanation:

Pipe A alone can fill the pool in 4 hours.

So, in 1 hour it fills $\frac{1}{4}$ part of the pool.

and in 30 minutea it fills $\frac{1}{8}$ part of the pool.

If the pipe B is opened after 30 minutes the pipe A opened.

So, $(1-\frac{1}{8} ) =\frac{7}{8}$ part of the pool is filled by both the pipe.

Again, pipe B alone fills the pool in 4 hours.

Hence, if both the pipes are open then they will fill in one hour $(\frac{1}{4} +\frac{1}{4}) =\frac{1}{2}$ part of the pool.

So, the remaining $\frac{7}{8}$ part of the pool will be filled by both the pipe in $\frac{\frac{7}{8} }{\frac{1}{2} } =\frac{7}{4}$ hours i.e. 1.75 hours.

Therefore pipe A will fill the pool in (0.5 + 1.75) =2.25 hours and pipe B will fill the pool in 1.75 hours. (Answer)

6 0

3 years ago

A manufacturer of college textbooks is interested in estimating the strength of the bindings produced by a particular binding ma

stepladder [879]

Answer: 196

Step-by-step explanation:

As per given , we have

Population standard deviation: $\sigma=0.6\ lb$

Significance level : $\alpha: 1-0.98=0.02$

Using the z-value table , the critical z value for 98% confidence : $z_{\alpha/2}=2.33$

Margin of error : E= 01 lb

Sample size : $n=(\dfrac{z_{\alpha/2}\cdot\sigma}{E})^2$

$n=(\dfrac{(2.33)\cdot(0.6)}{0.1})^2$

Simplify , we get

$n=195.4404\approx196$

Hence, the minimum sample size required for books = 196

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3 years ago

In a large lecture hall there are 300 students of which 160 are male and 165 are female. If one student is selected at Radom det

garik1379 [7]

165/300 -> 55%
This doesn't make much sense though, either the question is out of context or there is some typo because empirical probability is based on results you get from an experiment and actually doing the trial, not on what happens mathematically

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4 years ago

(0,1) (2,3) (4,5) (3,6) (4,2) (3,9) <br> Domain <br> Range <br> Function

Wittaler [7]

Domain: 0,2,3,4
range:1,2,3,5,6,9
function: no

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3 years ago

1. Which graph describes the relation {(1, 2), (1, -2), (−1, 2), (-2, 0)}?

Leviafan [203]

Answer:

The first graph

Step-by-step explanation:

The second graph does not have a point at (1, -2).

5 0

2 years ago