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2 years ago

Please help me. I don’t understand

Mathematics

2 answers:

oksian1 [2.3K]2 years ago

6 0

Answer:

im pretty sure its the 3rd one i might be wrong

Step-by-step explanation:

-1 wont happen

.4 there is a chance of it happening

1 its not deffinate for only 1 as a chance

Mice21 [21]2 years ago

6 0

Answer:

I think D is the correct answer

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A cylinder has diameter of 4ft and a height of 9ft. Explain whether halving the diameter has the same effect on the surface area

elena55 [62]

Answer:

See Below

Step-by-step explanation:

The surface area of cylinder is given by the formula:

$SA=2\pi r^2 + 2\pi r h$

Where

r is radius ( diameter is 4, so radius is 4/2 = 2)

h is height ( h = 9)

Lets find original surface are:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (9)\\SA=8\pi +36\pi\\SA=44\pi$

<u>Halving diameter:</u>

diameter would be 4/2 = 2, so radius would be 2/2 = 1

So, SA would be:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (1)^2 + 2\pi (1) (9)\\SA=2\pi +18\pi\\SA=20\pi$

<u>Halving height:</u>

Height is 9, halving would make it 9/2 = 4.5

Now, calculating new SA:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (4.5)\\SA=8\pi + 18\pi\\SA= 26\pi$

Original SA is $44\pi$ ,

Halving diameter makes it $20\pi$

Halving height makes it $26\pi$

So, halving diameter does not have same effect as halving height.

5 0

3 years ago

Vivian won a $18 gift certificate to a Mexican restaurant. She must spend more than the

7nadin3 [17]

Answer:

$7x+y>18$

Step-by-step explanation:

$7x$ is 7 dollars times the amount of burritos

$y$ is 1 dollar times the amount of tacos

$>$ because the final price has to be more than the gift card

$18$ the money on the gift card

7 0

3 years ago

Taylor wants to install new carpet in her living room. The room length is 15 ft and the width is 15 ft. If the cost of the carpe

irga5000 [103]

Answer:

$1,800.

Step-by-step explanation:

15 x 15 = 225

225 x 8 = 1800

Feel free to let me know if you need more help! :)

7 0

3 years ago

I need step by step explanation for this!

damaskus [11]

Answer:

Step-by-step explanation:

13 - 1 = 12
12 ÷ 2 = 6
Put 6 and 1 together: 61

Therefore, the number is 61

Let's check:

6 × 2 = 12
12 + 1 = 13

The sum of the two digits is 13, and we got that, so we are correct. The number is 61.

5 0

3 years ago

Read 2 more answers

Guys please help me out ASAP, Due today. I

Mice21 [21]

Answer:

$T_7 = 11$

$T_n = 2n- 3$

Step-by-step explanation:

Given

$S_n = n^2 -2n$

$T_n = S_n - S_{n-1}$

Solving (a): T7

Substitute 7 for n in $T_n = S_n - S_{n-1}$

$T_7 = S_7 - S_{7-1}$

$T_7 = S_7 - S_6$

Calculate S7 and S6

$S_n = n^2 -2n$

$S_7 = 7^2 - 2 * 7 = 35$

$S_6 = 6^2 - 2 * 6 = 24$

So:

$T_7 = 35 -24$

$T_7 = 11$

Solving (b): Tn

$T_n = S_n - S_{n-1}$

Where $S_n = n^2 -2n$

Calculate $S_{n-1}$

We have:

$S_{n-1} =(n-1)^2 - 2(n-1)$

Open brackets

$S_{n-1} = n^2 -2n + 1 -2n +2$

$S_{n-1} = n^2 -2n-2n + 1 +2$

$S_{n-1} = n^2 -4n + 3$

So:

$T_n = S_n - S_{n-1}$

$T_n = n^2 - 2n - (n^2 -4n + 3)$

$T_n = n^2 - 2n - n^2 +4n - 3$

Collect Like Terms

$T_n = n^2 - n^2- 2n +4n - 3$

$T_n = 2n- 3$

5 0

3 years ago