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3 years ago

Michael was 1.0 metres tall, and could

Mathematics

1 answer:

Artist 52 [7]3 years ago

4 0

Answer:

Lucy must walk up 80 steps to reach the 6th floor.

Step-by-step explanation:

Since Michael was 1.0 meters tall, and could only reach up to the 1st floor lift button, and from the 1st floor, he had to walk up 100 steps to reach the 6th floor; while Vinh was 1.4 meters tall, and could reach the 5th floor button, and he had to walk up 20 steps to reach the 6th floor; If Lucy was 1.1 meters tall, to determine how many steps did she have to walk up to reach the 6th floor, the following calculation must be performed:

1 = 100

1.4 = 20

1.4 - 1 = 100 - 20

0.4 = 80

0.1 = X

0.1 x 80 / 0.4 = X

20 = X

100 - 20 = 80

Therefore, Lucy must walk up 80 steps to reach the 6th floor.

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Manuela has a piece of red ribbon 7 1/2 feet long. She cut the ribbon to have one piece 1 3/4 feet long.

Zarrin [17]

Answer:

the leftover piece of ribbon is 5 3/4 feet long.

Step-by-step explanation:

if she has 7 1/2 feet of ribbon, and she removes (by cutting it off) 1 3/4 feet of ribbon.

So, if we set up this scenario like a math problem, we can write it as this:

7 1/2 feet of ribbon - 1 3/4 feet of ribbon = remaining ribbon

[ - = take away]

so, we are solving the equation:

7 1/2 - 1 3/4

To solve this, it is easiest to make the fractions have the same denominators

1 / 2 is equal to 2 / 4

However, 2/4 is less than 3/4, so we need to make this fraction a larger number.

To do this, we can take away 1 foot from the 7, and write it as if it were fourths

1 [foot] = 4/4 quarter foot

So, we can add 4/4 + 2/4 = 6/4

Now, we can re-write our situation.

6 6/4 - 1 3/4 = left over ribbon

6 6/4

- 1 3/4

__________

5 3/4

So, the leftover piece of ribbon is 5 3/4 feet long.

Hope this helps!

8 0

2 years ago

Pleaseee help BRAINLIEST

Fynjy0 [20]

Answer:

Its b

Step-by-step explanation:

if -2x-1=2 then 2+3 = 5

which is (-1,5)

7 0

3 years ago

Read 2 more answers

In right triangle ABC, where c is the hypotenuse, a = 6, c = 10, and b = x -2. Solve for x. A) 6 B) 8 C) 10 D) 12 is the answer

ehidna [41]

Yes the answer would be B

8 0

4 years ago

Read 2 more answers

gary buys 3 1/2 pound bag of cat food every 3 weeks gary feeds his cat the same amount of food each day which expression can gar

Dovator [93]

3 1/2 * 365/21
(not sure though)

8 0

4 years ago

g Georgianna claims that in a small city renowned for its music school, the average child takes at least 5 years of piano lesson

sergij07 [2.7K]

Answer:

[3.75 years, 5.45 years]

Step-by-step explanation:

The 90% confidence interval is given by the interval

$\large [\bar x-t^*\frac{s}{\sqrt n}, \bar x+t^*\frac{s}{\sqrt n}]$

where

$\large \bar x$ is the sample mean

s is the sample standard deviation

n is the sample size

$\large t^*$ is the 0.05 (5%) both-sided (**) critical value for the Student's t-distribution with 19 degrees of freedom (sample size -1), which is an approximation to the Normal distribution for small samples (n≤ 30).

Either by using a table or the computer, we find

$\large t^*= 1.729$

and our 90% confidence interval is

$\large [4.6-1.729*\frac{2.2}{\sqrt{20}}, 4.6+1.729*\frac{2.2}{\sqrt{20}}]=\boxed{[3.75,5.45]}$

(**) 5% of the area to the left of $\large -t^*$ and 5% to right of $\large t^*$ for a total of 90% inside the interval $\large [-t^*,+t^*]$

5 0

3 years ago