2 years ago

How does an estimate help you place the decimal point when multiplying 3.9 ✖️5.3

Mathematics

1 answer:

Step2247 [10]2 years ago

3 0

Answer: 20.67
Hope it helps

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Kevin is 333 times as old as Daniel. 444 years ago, Kevin was 555 times as old as Daniel. How old is Kevin now?

My name is Ann [436]

Let D be Daniel's present age, then we can represent Kevin's present age as 3D because Kevin is 3 times as old as Daniel.

We can write an expression for Daniel's age 4 years ago as D-4 and Kevin's age 4 years ago as 3D-4.

We are told that 4 years ago Kevin was 5 times as old as Daniel. We can write this information as:

$3D-4=5\cdot(D-4)$

Now let us solve our equation to find Daniel's present age.

$3D-4=5D-20$

$-4+20=5D-3D$

$16=2D$

$D=\frac{16}{2}=8$

Daniel's present age is 8 years. Now we will multiply 8 by 3 to get Kevin's present age as Kevin is 3 times old as Daniel.

$\text{Kevin's present age}=8\cdot3=24$

Therefore, Kevin is 24 years old now.

8 0

2 years ago

Read 2 more answers

A contractor digs a hole for the basements of a new house that is 40 feet long and 10 1/2 feet deep. What is the width of the ho

34kurt

D. 15.5

40*10.5 = 420

6510/420 = 15.5

7 0

2 years ago

45 POINTS!!!!!!!!!!

yanalaym [24]

Y-3 is the correct answer

5 0

2 years ago

4(x-4)-3x=10 what is the answer

max2010maxim [7]

Answer:

Step-by-step explanation:

4(x-4)-3x=10

Rule = a(b + c) = ab + ac
Rule = a(b - c) = ab - ac

4(x-4) = 4x - 16

4(x-4)-3x=10

4x - 16 - 3x = 10

x - 16 = 10

x -16 +16 = 10 +16

x = 26

Hope this helps ^-^

6 0

2 years ago

I need help on #2 I want to know if it’s right

anastassius [24]

I would’ve gone with the same choice so I think it’s right!!

6 0

3 years ago