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jenyasd209 [6]
3 years ago
13

Which expression is equivalent to (13r-16) + (-21r + 20)

Mathematics
1 answer:
LUCKY_DIMON [66]3 years ago
4 0

Answer:

-8r + 4

Step-by-step explanation:

13r and -21r are like terms are both like terms so you can add them up ant get -8r

Same with -16 and 20 which will give you 4

_8r + 4

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SA = 2tr2 + 2trh
julsineya [31]

Given:

Radius of the cylinder = 5 in

Height of the cylinder = 30 in.

To find:

The surface area of the cylinder.

Solution:

The surface area of the cylinder is:

SA=2\pi r^2+2\pi rh

Where, r is the radius and h is the height of the cylinder.

Putting r=5,h=30,\pi=3.14 in the above formula, we get

SA=2(3.14)(5)^2+2(3.14)(5)(30)

SA=2(3.14)(25)+942

SA=157+942

SA=1099


Therefore, the surface area of the cylinder is 1099  square inches.

6 0
3 years ago
How to solve 2x(x+3)=2x^2+15
Travka [436]

Answer: x = 5/2 = 2.5

Step-by-step explanation:

<u>Given expression</u>

2x (x + 3) = 2x² + 15

<u>Expand parentheses and apply the distributive property</u>

2x · x + 2x · 3 = 2x² + 15

2x² + 6x = 2x² + 15

<u>Subtract 2x² on both sides</u>

2x² + 6x - 2x² = 2x² + 15 - 2x²

6x = 15

<u>Divide 6 on both sides</u>

6x / 6 = 15 / 6

x = 15/6

\boxed{x=\frac{5}{2} }

Hope this helps!! :)

Please let me know if you have any questions

5 0
3 years ago
Read 2 more answers
Janet deposits $3,000 in a savings account that earns 2% simple interest per year. how much interest will she earn after 1 year?
Irina18 [472]
3,000 * .02 = 60.00 interest for 1 year

4 0
3 years ago
Fact family for 3, 5, 8
olya-2409 [2.1K]

Answer:

3+5=8

5+3=8

8-3=5

8-5=3

Step-by-step explanation:

8 0
3 years ago
the athletic department spent $11,250 on the 15 sports at the school. what is the rate that the athletic department spent in eac
Sholpan [36]

Answer:

$11,250 divided by 15 is 750, which means that the answer is the rate is $750 dollars spent in each sport.

5 0
3 years ago
Read 2 more answers
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