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Pachacha [2.7K]
3 years ago
10

How many even numbers are between 11 and 30​

Mathematics
1 answer:
Debora [2.8K]3 years ago
8 0

Answer:

9 even numbers are between 11 and 30.

Step-by-step explanation:

12, 14, 16, 18, 20, 22, 24, 26, 28

You might be interested in
3/25 ÷.......... = 25/3​
Degger [83]

Answer:

1

Step-by-step explanation:

3 0
3 years ago
an open rectangular cardboard box with a square base is to have a volume of 256cm^3. Find the dimensions of the box if the area
Anit [1.1K]
Let
x------> the length side of the square base of the box
y-------> the height of the box

we know that
volume of the box=b²*h
b=x
h=y
volume=256 cm³
so
256=x²*y------>y=256/x²-------->  equation 1

<span>The amount of material used is directly proportional to the surface area, so we will minimize the amount of material by minimizing the surface area.</span>

surface area of the cardboard=area of the base+perimeter of base*height
area of the base=x²
perimeter of the base=4*x
height=y
surface area=x²+4x*y-----> equation 2
substitute equation 1 in equation 2
SA=x²+4x*[256/x²]-----> SA=x²+1024/x

step 1 
find the first derivative of SA and equate to zero
2x+1024*(-1)/x²=0------> 2x=1024/x²----> x³=512--------> x=8 cm
y=256/x²------> y=256/8²-----> y=4 cm

the answer is
the length side of the square base of the box is 8 cm
the height of the box is 4 cm

5 0
3 years ago
What is the slope of this line A -1/2 B 1/2 C 2​
denpristay [2]
-1/2 is your answer to this question
4 0
2 years ago
20% of the dogs at the pound needed medical care. what is the ratio of dogs that needed care and dogs that did not
Aleksandr-060686 [28]
I believe it is 1 : 5. Hope this helps :)
7 0
3 years ago
-3(-6u+6)-3u=5(u-2)-3
riadik2000 [5.3K]

Answer:

u=1/2

Step-by-step explanation:

-3(-6u+6)-3u=5(u-2)-3

18u-18-3u=5u-10-3

15u-18=5u-13

15u-5u-18=-13

10u-18=-13

10u=-13+18

10u=5

u=5/10

simplify

u=1/2

5 0
3 years ago
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