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3 years ago

What’s the correct answer for this?

Mathematics

1 answer:

dybincka [34]3 years ago

5 0

Answer:

(A)

Step-by-step explanation:

Using the formula :

Area = 1/2 [-1(1 - 6) -7(6 - 1) -3(1 - 1)]

Area = 1/2 [5 - 35]

Area = 1/2 × -30 = |-15| = 15 units²

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An item was bought for £50. It was sold for £32. What was the percentage loss?

kumpel [21]

Answer:

36% loss

Step-by-step explanation:

To calculate percentage loss

$\frac{loss}{original}$ × 100%

loss = £50 - £32 = £18, then

percentage loss = $\frac{18}{50}$ × 100% = 18 × 2 % = 36%

5 0

3 years ago

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Round 829 to the nearest tenth

Ainat [17]

829 rounded to the nearest tenth is 830

If the 9 would be a 4 or lower, then it would be 820, but in this case, it's a number larger than 5, so it would be 830.

6 0

4 years ago

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A certain type of automobile battery is known to last an average of 1140 days with a standard deviation of 80 days. If 400 of th

Sever21 [200]

Answer:

Mean = $\mu = 1140$

Standard deviation = $\sigma = 80$

Find the probabilities for the average length of life of the selected batteries.

A)The average is between 1128 and 1140.

We are supposed to fidn P(1128<x<1140)

Formula : $Z=\frac{x-\mu}{\sigma}$

At x = 1128

$Z=\frac{1128-1140}{80}$

$Z=-0.15$

Refer the z table for p value

P(x<1128)=0.4404

At x = 1140

$Z=\frac{1140-1140}{80}$

$Z=0$

Refer the z table for p value

P(x<1140)=0.5

So,P(1128<x<1140)=P(x<1140)-P(x<1128)=0.5-0.4404=0.0596

Hence the probabilities for the average length of life of the selected batteries is between 1128 and 1140 is 0.0596

B)The average is greater than 1152.

P(x>1152)

At x = 1128

$Z=\frac{1152-1140}{80}$

$Z=0.15$

Refer the z table for p value

P(x<1152)=0.5596

So,P(x>1152)=1-P(x<1152)=1-0.5596=0.4404

Hence the probabilities for the average length of life of the selected batteries is greater than 1152 is 0.4404

C) The average is less than 940.

P(x<940)

At x = 940

$Z=\frac{940-1140}{80}$

$Z=-2.5$

Refer the z table for p value

P(x<940)=0.5596

Hence the probabilities for the average length of life of the selected batteries is less than 940 is 0.5596

7 0

3 years ago

14.371 value of 1 in decimal form

artcher [175]

0.001. hope that helped

7 0

4 years ago

The distance, d, an object travels is represented by the equation d = rt, where r represents the average rate of speed and t rep

Salsk061 [2.6K]

Answer:

B. seconds

Step-by-step explanation:

We have d=rt

means that t= $\frac{d}{r}$

<u>Given the units of each:</u>

d: feet

r: feet/second

<u>Replace each with its unit:</u>

t= $\frac{feet}{\frac{feet}{second} }$ = $\frac{feet.second}{feet}$ = second

So the unit of t is seconds (option B.)

4 0

2 years ago

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