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2 years ago

Please help hurry fast thanks

Mathematics

2 answers:

Ray Of Light [21]2 years ago

6 0

Answer: No

Step-by-step explanation:

If he spent 30 minutes making 1 boat, then it would take him two hours to make it

yan [13]2 years ago

4 0

Answer:

30 x 4 = 120 minutes = 2 hours

Step-by-step explanation:

It won't take Brian 3 hours to make 4 boats. Multiply 30 by the number of boats to get the number of minutes then convert to hours.

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Create an equivalent expression that includes a set of parentheses that make the value of the expression 13. Remember, you can h

kenny6666 [7]

I don't think that you put parentheses around any numbers because when I solve it with parentheses between numbers I get other numbers like 16 or 17

7 0

2 years ago

Round 657 to the nearest ten

STALIN [3.7K]

660 would be the nearest ten. you round up because the final number is with 5 or greater. if the final number was 4 or less, you would round down. I hope this helped you

4 0

2 years ago

Read 2 more answers

Pls help me this question is bad

musickatia [10]

Answer:

using law of indices

the answer is 1

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1 year ago

Which problem is equivalent to 12/18

Olenka [21]

Answer:

Step-by-step explanation:

5 0

2 years ago

The heat developed in an electric wire varies jointly as the wires resistance, the time the current flows, & the square of t

never [62]

Answer:

4 ohms

Step-by-step explanation:

The question is "In two minutes a current of 5 amps develops 1,200 heat units in a wire of 8 ohms resistance. What resistance does a similar wire have, which develops 6,000 heat units with a current of 10 amps in 5 minutes?"

Current, I₁ = 5 A

Heat, Q₁ = 1200 units

Resistance, R₁ = 8 ohms

Time, t₁ = 2 min = 120 s

New heat, Q₂ = 6000 units

Current, I₂ = 10 A

New time, t₂ = 5 min = 300 s

We need to find the new resistance.

Heat developed is given by :

$Q=I^2Rt$

$\dfrac{Q_1}{I_1^2R_1t_1}=\dfrac{Q_2}{I_2^2R_2t_2}\\\\R_2=\dfrac{Q_2\times I_1^2R_1t_1}{Q_1I_2^2t_2}\\\\R_2=\dfrac{6000\times 5^2\times 8\times 120}{1200\times 10^2\times 300}\\\\=4\ \Omega$

So, the new resistance is 4 ohms.

5 0

2 years ago

Please help hurry fast thanks​

Please help hurry fast thanks