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maksim [4K]
3 years ago
15

9. The theater club of a local high school is planning a production. The amount of time t needed to assemble the set is inversel

y
proportional to the number people n working. Twelve people can assemble the set in 5 hours.
Write an equation to represent the situation.
Mathematics
1 answer:
Vsevolod [243]3 years ago
8 0

Answer:

The situation that represents this situation is:

t = \frac{60}{n}

Step-by-step explanation:

The amount of time t needed to assemble the set is inversely  proportional to the number people n working.

This means that:

t = \frac{k}{n}

In which k is the constant of proportionality.

Twelve people can assemble the set in 5 hours.

This means that for n = 12, t = 5. We use this to find k.

t = \frac{k}{n}

5 = \frac{k}{12}

k = 12*5 = 60

Write an equation to represent the situation.

t = \frac{60}{n}

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the sum of two numbers is -4 and their difference is -10. find the numbers. (translate to a system of equations and solve)
fiasKO [112]

Answer:

The numbers are -7 and -3

8 0
4 years ago
Can someone please help me
Ket [755]

Answer:

the answer should be -4

Step-by-step explanation:

-4 squared would be 8. 3 multiplied by -4 would be -12. 8 + -12 = -4. -4 + 4 = 0

4 0
3 years ago
For how many three digit numbers (100 to 999) is the sum of the digits even? (For example, 343 has an even sum of digits: 3 + 4
n200080 [17]

Answer:

there are 425 numbers of three digits whose the sum of the digits is even.

Step-by-step explanation:

Option 1:

It is necessary to accomplish one of the next conditions:

(1) all of the digits are even.

(2) exactly 2 of the digits are odd

Then, for the first condition:

4x5x5 = 100 -> this is because the first digit can not be 0.

for the second condition:

(3C1)*5*5*5-1*5*5 =3*125-25=350

where 3C1 is a combination.  The 3C1 determines which of the three digits is even, and it is necessary to subtract the numbers under 100 with the other 2 digits odd.

So, there are 450 numbers of three digits whose the sum of the digits is even.

Option 2:

there are 900 three digit number and 5*5*5 =125 has 3 odd numbers and 5*5*5+4*5*5+4*5*5=325 has 1 odd number, so there are 450 numbers of three digits whose the sum of the digitis is odd, so 900-450 whose the sum of the digits is even.

4 0
3 years ago
20 is 40% of what number
tensa zangetsu [6.8K]
Is means equal

of means multiplication

so

20 = 40% x a

40% = 40/100 = 4/10 = 2/5

So

20 = 2/5 x a

Multiply both sides by 5/2

20 x 5/2 = a

10 x 5 = a

a =50

So your final answer is \boxed{\bf{50}}
5 0
3 years ago
Read 2 more answers
Is 90 a composite number?
konstantin123 [22]

Answer:

No

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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