MATHEMATICS HIGH SCHOOL

Make a formula to find the of the diameter 'a' if the area is 'A'. ​

Answers

Answer 1
Answer:

Answer:

2\sqrt{(A)/(\pi)} = a

Step-by-step explanation:

I am assuming that you are referring to the diameter and area of a circle. If this is false, then please note that my answer is wrong.

Ok, we know that the area formula for a circle is A = \pi r^(2), where r is the radius.

We also know that the diameter, a, is two times the radius. Thus, a = 2r, which also means that  (1)/(2) a = r. This means that we can substitute the radius (r) with half the diameter ((1)/(2)a) in the area formula equation:

A = \pi *((1)/(2) a)^(2)

Your question asks us to find the diameter, which means we must solve for, or isolate, the diameter (a):

A = \pi *((1)/(2) a)^(2)\n(A)/(\pi) =((1)/(2) a)^(2)\n(A)/(\pi) =(1)/(4) a^(2)\n(4A)/(\pi) = a^(2)\n\sqrt{(4A)/(\pi)} = a\n2\sqrt{(A)/(\pi)} = a

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A train traveled 350km in 2.5h. what was the average speed of the train?

Answers

So the train traveled 350 km in 2.5 h let's do the work together what do you think we start off with we can divide 350 by 2.5 tell me what your answer is when you've done the division

24 21 is 60% of what number?

Answers

Answer:

could u explain it better

Answer: either I don't remember if you use the % or the number ok

Hope this helps

2421 × 60 = 145260

2421 × 60% = 1452.6

Step-by-step explanation:

Write as ratio in simplest form

91%, 12%, 6%, 93%, 62%, 14%, 70%, 400%,.

Answers

a)
91/100
we cannot simplify this

b) 12/100 = 6/50
cannot be simplified further

c) 6/100 = 3/50

d) 93/100
cannot be simplified

e) 62/100 = 31/50

f) 14/100 = 7/50

g) 70/100 = 7/10

h) 400/100 = 4

when something is in percentage that means it is some part of 100% that is why we divide by 100.

write an even number that has a 7 in the hundreds place , has an odd number in the thousands place and is multiple of 10

Answers

even numbers end with 0,2,4,6,8

7 in hundreds place

odd in thousands place, odd numbers are 1,3,5,7,9

multiplue of 10 end with 0

so therfor the number has 7 in hundreds place and ends with 0 with odd in thousands and undefined hundreds place

50 options

some examples are
1730
9790

any number, x7y0 such that x is odd and y can be any number

Can you please solve for m
2 = m/2-7

​

Answers

2 = m/2 - 7                  Original Problem.
m/2 - 7 = 2                  Flip flop the equation around.
m/2 = 9                       Add 7 to each side.
m = 18                        Multiply each side by 2.

Answer: m = 18

Find common denominators for three sevens and one and half

Answers

3/7 and 1 1/2

Now look at the two denominators: 7 and 2.

Because 7 and 2 are relatively prime, their least common multiple is:
7*2= 14

Therefore, 14 is a common denominator for 3/7 and 1 1/2.

Hope this helps~
3/7 and 1/2    14 is the common denominator    at the end it is   6/14  and 7/14
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