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12345 [234]
2 years ago
7

Write an expression that shows how to use the halving and doubling strategy to find 28×50

Mathematics
1 answer:
eduard2 years ago
4 0
Halving: 28 to 14 doubling: 50 to 100 answer: 14 × 100 = 1400
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Karen and James both had 30 stocking stuffer items on their shopping list. After black Friday shopping Karen had finished 35% of
mihalych1998 [28]

Answer: 7.5 items

Step-by-step explanation:

Both Karen and James had 30 stocking items.

Karen bought 35% of her items;

= 35% * 30

= 10.5 items

James has bought 60%;

= 60% * 30

= 18 items

= 18 - 10.5

= 7.5 items

6 0
2 years ago
A large mixing tank initially contains 1000 gallons of water in which 40 pounds of salt have been dissolved. Another brine solut
sergey [27]

Answer:

If A(t) represents the amount of salt in the tank at time t, the correct differential equation for A is is dA/dt =  15 - 0.005A

Option C) dA/dt =  15 - 0.005A is the correction Answer

Step-by-step explanation:

Given the data in the question;

If A(t) represents the amount of salt in the tank at time t, the correct differential equation for A is?

dA/dt = rate in - rate out

first we determine the rate in and rate out;

rate in = 3pound/gallon × 5gallons/min = 15 pound/min

rate out = A pounds/1000gallons × 5gallons/min  = 5Ag/1000pounds/min

= 0.005A pounds/min

so we substitute

dA/dt = rate in - rate out

dA/dt =  15 - 0.005A

Therefore, If A(t) represents the amount of salt in the tank at time t, the correct differential equation for A is is dA/dt =  15 - 0.005A

Option C) dA/dt =  15 - 0.005A is the correction Answer

8 0
2 years ago
rachel bought one double pack of CDs for $20. this is $4 less than 3/4 the cost of a triple pack of CDs. what is the price of a
Sophie [7]
The price of a triple pack of Cds is $30. 
6 0
3 years ago
Need Help! 10 points!
Dominik [7]
The answer is d because 4+8=12 and they are 4 units away from eachother:)
6 0
2 years ago
2. How comfortable are you working with proportions? (1 point)
LiRa [457]
How comfortable are you writing this whole paragraph goddam I could never divide 100
7 0
2 years ago
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