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4 years ago

I'm really stuck at these questions so someone please help

Mathematics

1 answer:

Debora [2.8K]4 years ago

8 0

1. Amount he has = $ 0.75
Amount he wants = $ 2.50
Amount that he needs = $( 2.50 - 0.75) = $ 1.75

2. Time taken in first half of race = 32.34 secs
Time taken in second half of race = 34.83 secs
Total time taken = (32.34 + 34.83) secs = 67.17 secs

3. Actual price of apple = $ 0.75
Amount paid by Jane = $ 5.00
Amount to be returned to Jane = $(5.00 - 0.75)
= $ 4.25

4. Distance covered by John = 0.7 miles
Distance covered by Nina = 0.4 miles
Distance that John covers more than Nina is given by = (0.7 - 0.4) miles = 0.3 miles

5.Weight of one pencil = 28.3 g
Weight of 5 pencils = 28.3 x 5 = 141.5 g

Hope This Helps You

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Which equation matches the graph y=-1x+3 , y=1x, y1x+3, y=-1x can you guys tell me which equation matches the graph with explana

Y_Kistochka [10]

Answer:

y = 1.x + 3

Step-by-step explanation:

Let the equation of the line is,

y = mx + b

Here, m = slope of the line

b = y-intercept

Slope of a line passing through two points $(x_1,y_1)$ and $(x_2,y_2)$ is given by,

m = $\frac{y_2-y_1}{x_2-x_1}$

Since, y-intercept and x-intercepts are equal,

Let the given line passes through (0, 3) and (-3, 0),

Slope of the line (m) = $\frac{3-0}{0+3}$ = 1

y-intercept of the line 'b' = 3

Equation of the line will be,

y = 1.x + 3

8 0

3 years ago

an organic farm uses 3/7 of the land to grow potatoes and two fifths of the land to grow spinach the remaining land is used to g

melomori [17]

The organic farm uses 3/7 of the land to grow potatoes
=> 2 /5 of the land to grow spinach
=> x = the fraction of the land to grow tomato plants.
The easiest wat to get the answer is convert first the fraction to decimals
=> 3/7 = 0.43
=> 2/5 = 0.4
=> x = ???
=> 0.43 + 0.4 = 0.83
=> let the whole land = 1
=> 1 – 0.83
=> 0.17, the remaining land left for tomato plants
Convert now to fraction
=> 17/100 (Approximately)

YOu can also use this method:
=> 3/7+ 2/5 +x = ?
Find the LCM
=> 3/7 + 2/5 = 29/ 35
=> 35/35 - 29 / 35
=> 6 / 35, the remaining land

8 0

4 years ago

I need help...............

V125BC [204]

Answer:

2 (a) d=3

(b) e= 21

3.(A) 3cm

This is your answer

6 0

3 years ago

A cellphone provider has the business objective of wanting to estimate the proportion of subscribers who would upgrade to a new

stiv31 [10]

Answer:

$z=\frac{0.27 -0.2}{\sqrt{\frac{0.2(1-0.2)}{500}}}=3.913$

$p_v =P(z>3.913)=0.000046$

So the p value obtained was a very low value and using the significance level given $\alpha=0.05$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of subscribers that would upgrade to a new cellphone at a reduced cost is significantly higher than 0.2 or 20%

Step-by-step explanation:

Data given and notation

n=500 represent the random sample taken

X=135 represent the subscribers that would upgrade to a new cellphone at a reduced cost

$\hat p=\frac{135}{500}=0.27$ estimated proportion of subscribers that would upgrade to a new cellphone at a reduced cost

$p_o=0.2$ is the value that we want to test

$\alpha=0.05$ represent the significance level

Confidence=95% or 0.95

z would represent the statistic (variable of interest)

$p_v$ represent the p value (variable of interest)

Concepts and formulas to use

We need to conduct a hypothesis in order to test the claim that true proportion is higher than 0.2 or not.:

Null hypothesis: $p \leq 0.2$

Alternative hypothesis: $p > 0.2$

When we conduct a proportion test we need to use the z statistic, and the is given by:

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

The One-Sample Proportion Test is used to assess whether a population proportion $\hat p$ is significantly different from a hypothesized value $p_o$ .

Calculate the statistic

Since we have all the info required we can replace in formula (1) like this:

$z=\frac{0.27 -0.2}{\sqrt{\frac{0.2(1-0.2)}{500}}}=3.913$

Statistical decision

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.

The significance level provided $\alpha=0.05$ . The next step would be calculate the p value for this test.

Since is a right tailed test the p value would be:

$p_v =P(z>3.913)=0.000046$

6 0

4 years ago

1. which ratio is equal to 15/20? 5/4 3/5 3/4 4/3

ziro4ka [17]

Answer: 3/4

Step-by-step explanation: 15/20 divided by 5/5 is equal to 3/4

6 0

3 years ago

Read 2 more answers