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3 years ago

8

How estimation helps you to place the decimal point when multiplying 3.9x5.3

2 answers:

LiRa [457]3 years ago

6 0

3.9 is nearly 4 and 5.3 is just over 5 so the answer will be in the region of 15 or thinking about the decimal point there will be a tens and unit answer followed by a decimal point

myrzilka [38]3 years ago

3 0

3.9 can be rounded to 4.
5.3 can be rounded to 5.

4 x 5 = 20

That tells you that 3.9 x 5.3 has a digit in the tens place.

Then you can proceed to multiply 39 and 53, which equals 2067.
(Note: I removed the decimals on purpose)

Now we know that in 2067, the 2 should be in the tens place. That means 0 is in the ones place and that 6 is in the tenths place. That leaves 7 to be in the hundreths place.

Therefore, 3.9 x 5.3 = 20.67

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4 years ago

A woman bought a dress at a discount of 16 2/3%. If the woman paid $32.50, what was the original price of the dress?

Anastaziya [24]

Let's let x equal the original price of the dress.

We know that 16.6666% is equal to 0.16666 in decimal form by dividing the percent by 100.

So we can set up the equation:

$x-0.16666x=32.50$

because we know the discount, and we know that the discount of the original price was subtracted from the original price.

So then let's simplify by taking out x, the common factor:

$x(1-0.16666)=32.50$

Then solve for x:

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So now we know that the original price of the dress was $39.

3 0

3 years ago

An inelastic collision occurs between a large truck and smaller sedan. Calculate the final velocity of the objects and explain t

k0ka [10]

The final velocity is 15.8 m/s in the forward direction

Step-by-step explanation:

An inelastic collision occurs when the two object after the collision stick together.

In any case, the total momentum of the system is conserved before and after the collision, in absence of external forces. Therefore, we can write:

$p_i = p_f\\m u + MU = (m+M)v$

where in this problem:

m = 1300 kg is the mass of the small sedan

u = 20 m/s is the initial velocity of the small sedan

M = 7100 kg is the mass of the truck

U = 15 m/s is the initial velocity of the truck

v is the final combined velocity of the small sedan + truck

Here we have taken both the velocity of the sedan and the truck in the positive (forward) direction

Solving the equation for v, we find the final velocity:

$v=\frac{mu+MU}{m+M}=\frac{(1300)(20)+(7100)(15)}{1300+7100}=15.8 m/s$

And since the sign is positive, this means that is direction is the same as the initial direction of the sedan and the truck, so forward.

Learn more about collisions:

brainly.com/question/13966693#

brainly.com/question/6439920

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4 years ago

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Alecsey [184]

Answer:

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Step-by-step explanation:

Based on information provided this is what I think is the answer

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3 years ago

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kirill115 [55]

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4 years ago

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