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3 years ago

I’m in need of serious math help.

Mathematics

2 answers:

NemiM [27]3 years ago

5 0

The answer is the first one

marysya [2.9K]3 years ago

5 0

The first onedtdbddhdnd

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A speedometer has a percent error of 10%. The actual speed of the car is 40 mph. Select from the drop-down menus to correctly co

rodikova [14]

Answer

The speedometer is likely to show the speed is either 36.0 mph or 44.0 mph.

To prove

Formula

$Percentage\ error = \frac{error\times 100}{Exact\ value}$

Where error = |Approx value - Exact value |

First case

As given

A speedometer has a percent error of 10%. The actual speed of the car is 40 mph.

Here

Percentage error = 10%

Exact value = 40 mph

error = - (Approx value - Exact value )

= - (Approx value - 40 )

= - Approx value + 40

Put in the formula

$10 = \frac{(-Approx\ value + 40)\times 100}{40}$

$400 = {(-Approx\ value + 40)\times 100}$

$\frac{400}{100} =-Approx\ value + 40$

$\4 =-Approx\ value + 40$

Thus

Approx value = 40 - 4

Approx value = 36 mph

Therefore Option (b) is correct .

Second Case

error = (Approx value - Exact value )

= (Approx value - 40 )

= Approx value - 40

Put in the formula

$10 = \frac{(Approx\ value - 40)\times 100}{40}$

$400 = {(Approx\ value - 40)\times 100}$

$\frac{400}{100} = Approx\ value - 40$

$\4 = Approx\ value - 40$

Thus

Approx value = 40 + 4

Approx value = 44 mph

Therefore Option (c) is correct .

4 0

2 years ago

Students at Springfield Middle school are planning to rooftop a garden.They plan to plant flowers in 18 beds,which is 30% of the

Sophie [7]

Answer:

Step-by-step explanation:

Since 30%/3 is 10%, 6 is 10% of the total number of garden beds, since 18/3 is 6.

And 10% times 10 is 100%, or all of it, so 60 is the total amount of garden beds, since 6 times 10 is 60.

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3 years ago

gil owns a life insurance policy that he purchased when he first graduated college it has a 100000 death benefit and gil pays pr

Scorpion4ik [409]

The insurance Gil has is most likely individual life insurance.

7 0

3 years ago

Read 2 more answers

Jennifer had a7/8-foot board. she cut off a 1/4-foot piece that was for a project. in feet, how much of the board was left?

den301095 [7]

7/8 - 1/4 = ? (we need common denominators to add)
7/8 - 2/8 (multiplied second fraction by 2/2 to get a common denominator)

5/8 answer

8 0

3 years ago

A bag contains 16 blue marbles,8 green marbles and 12 red marbles. What is the ratio of blue to green to red marbles in its simp

blsea [12.9K]

Answer:

4:2:3

Step-by-step explanation:

16 blue marbles,8 green marbles and 12 red marbles.

Ratio of blue to green to red

blue:green:red

16:8:12

We can divide each term by 4

16/4:8/4:12/4

4:2:3

4 0

3 years ago