Can anyone help me with primary 5 hw ?

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Answer 1

Answer: b) 28×50, then take the answer - 1100

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The Silver Lake Reservoir in California is being drained to make way for an underwater pipeline. The reservoir holds 400400400 million gallons of water, and it is estimated that the drainage will take at least 252525 days. If the water is drained at a constant rate, what is the maximum rate of drainage, in millions of gallons per day?

Answers

Divide the total the lake holds by the number of days:

400 million / 25 days = 16 million gallons per day.

The maximum rate of drainage, in millions of gallons per day is 16 millions of gallons per day.

What is a word problem?

A word problem is a verbal description of a problem situation. It consists of few sentences describing a 'real-life' scenario where a problem needs to be solved by way of a mathematical calculation.

For the given situation,

Amount of water reservoir can hold = 400400400 million gallons of water ≈ $400$ million gallons

Estimated days will drainage take = 252525 days ≈ $25$ days

Then the maximum rate of drainage, in millions of gallons per day is

⇒ $(400 )/(25)$

⇒ $16$

Hence we can conclude that the maximum rate of drainage, in millions of gallons per day is 16 millions of gallons per day.

Learn more about word problems here

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1. There are 6 girls and 7 boys in a class. A team of 10 players is to be selected from the class. How many different combinations of players are possible?2. There are 6 girls and 7 boys in a class. A team of 10 players is to be selected from the class. If the selection is random, what is the probability of selecting a team of 5 girls and 5 boys? what is the decimal?

Answers

Answer: 1. 286 different combinations of players are possible.

2. The probability of selecting a team of 5 girls and 5 boys is $(63)/(143)$ and the decimal is 0.4405...

Step-by-step explanation:

1. Number of girls is 6 and number of boys is 7.

So, the total number of players = 6+7 = 13

A team of 10 players is to be selected from the class.

So, the total possible number of different combinations of players will be: $^1^3C_(10) = (13!)/(10! (13-10)!)=(13*12*11*10!)/(10!*3!)= (13*12*11)/(6)=286$

2. Number of girls is 6 and number of boys is 7.

The possible number of teams by selecting 5 girls and 5 boys will be: $^6C_(5)* ^7C_(5) =6* 21= 126$

and the number of total possible teams of 10 players $= ^1^3C_(10) =286$

Thus, the probability of selecting a team of 5 girls and 5 boys $=(126)/(286)= (63)/(143)$ or $0.4405...$

a DVD that originally cost $30 was marked up for 10 percent. What is the cost for the DVD after mark up ?

Answers

Answer:

Step-by-step explanation:

Answer:

The answer is

33$

Step-by-step explanation:

A square has an area of 144 square feet. What is the length of each side?

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the area of the square is length × length , so if we need the length of each side all what we have to do is the square root of 144 which is 12 .. so 12 is the length of each side .. I hope that would help you ;)

How many grams are in 40 hectograms? 400 4,000 40,000 400,000

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4000 grams in 40 hectograms

4000grams is 40 hectograms

I need to know how to multiply integers.

Answers

An example would be:

4 x 5 = 20

I think its the same way you multiply normal numbers.

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