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3 years ago

Help please!!!!!!!! what is the answer

Mathematics

2 answers:

Anon25 [30]3 years ago

7 0

Answer:

About 20 inches or A

Please give Brain

and hope this helped :D

Step-by-step explanation:

icang [17]3 years ago

6 0

Answer:

A: 20

Step-by-step explanation:

There are 12 inches in a foot.

4.5 x 12 = 54,

2 x 12 = 24,

54 + 24 = 78.

As for how many inches were needed:

7 x 14 = 98,

98 - 78 = 20.

They need 20 more inches.

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Bob and rob in ratio 3:4 and their age 4 years ago was 5:7 find their ages

Trava [24]

Answer:

Present Day:

Bob:Rob:Difference

3 : 4 : 1

6 : 12 : 2

4 years ago:

Bob:Rob:Difference

5 : 7 : 2

6 0

3 years ago

MULTIPLE CHOICE GEOMOTRY QUESTIOON

rosijanka [135]

Answer: D

Step-by-step explanation: Im vv sure, is this a test?

7 0

3 years ago

The operations manager of a manufacturer of television remote controls wants to determine which batteries last the longest in hi

Margarita [4]

Answer:

$t=\frac{107.75-116.75}{\sqrt{\frac{2.75^2}{4}+\frac{9.604^2}{4}}}}=-1.802$

The degrees of freedom are given by:

$df=n_{1}+n_{2}-2=4+4-2=6$

The p value for this case would be given by:

$p_v =2*P(t_{(6)}$

Since the p value is higher than the significance level we have enough evidence to FAIl to reject the null hypothesis and we can conclude that the true mean is not significantly different between the two types of battery

Step-by-step explanation:

Information given

Battery 1 106 111 109 105

Battery 2 125 103 121 118

We can calculate the mean and the deviation with the following formulas"

$\bar X =\frac{\sum_{i=1}^n X_i}{n}$

$s =\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

$\bar X_{1}=107.75$ represent the mean for the Battery 1

$\bar X_{2}=116.75$ represent the mean for the Bettery 2

$s_{1}=2.75$ represent the sample standard deviation for the Battery 1

$s_{2}=9.604$ represent the sample standard deviation for the battery 2

$n_{1}=4$ sample size selected for the Battery 1

$n_{2}=4$ sample size selected for the Battery 2

$\alpha=0.1$ represent the significance level

t would represent the statistic

$p_v$ represent the p value

System of hypothesis

We want to check if the difference in longevity between the two batteries, the system of hypothesis would be:

Null hypothesis: $\mu_{1} = \mu_{2}$

Alternative hypothesis: $\mu_{1} \neq \mu_{2}$

The statistic is given by:

$t=\frac{\bar X_{s1}-\bar X_{2}}{\sqrt{\frac{s^2_{1}}{n_{1}}+\frac{s^2_{2}}{n_{2}}}}$ (1)

The statistic is given by:

$t=\frac{107.75-116.75}{\sqrt{\frac{2.75^2}{4}+\frac{9.604^2}{4}}}}=-1.802$

The degrees of freedom are given by:

$df=n_{1}+n_{2}-2=4+4-2=6$

The p value for this case would be given by:

$p_v =2*P(t_{(6)}$

8 0

3 years ago

Gabe Industries sells two products, Basic models and Deluxe models. Basic models sell for $41 per unit with variable costs of

Hitman42 [59]

Answer:

b. 63 units

Step-by-step explanation:

The breakeven point occurs when the revenue is equal to the expenses. It means that the profit is 0. So, for the Basic model, the revenue is the sell less the costs: $41 - $15 = $26.For the Deluxe model, the revenue per unit is 0 ($45 - $45).

So, calling x the Basic model units, ad y the Deluxe model units, the total revenue will be: 26x, which must be equal to the expenses = $1,310.40:

26x = 1310.40

x = 50.4 units

y = x/4, because for 1 Deluxe model four Basic models are selled.

y = 50.4/4 = 12.6 units

The total units for breakeven point is 50.4 + 12.6 = 63 units.

8 0

4 years ago

I need help on this. An answer and an explanation would be great!!

charle [14.2K]

Answer:

60 & 55

Step-by-step explanation:

1. the sum of the angles 1; 2 and 3 is 180°, then

m∠1=m∠2=m∠3; ⇒m∠3=60°;

2. m∠3=m∠r; ⇒ m∠r=60°;

3. m∠α= 180-(m∠r+65°)°; ⇒ m∠α=55°

all the details are in the picture.

4 0

3 years ago