How do you write 254 millimeters in scientific notation

Mathematics

1 answer:

tatyana61 [14]3 years ago

4 0

The answer is 2.54*10^2 mm

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Could you please help me with this? It’s a problem from my grandson’s homework.

gulaghasi [49]

SOLUTION

From the question given, the cost of the toy truck is $36.50 before tax.

Now, the store selling the toy truck adds a 6% sales tax. This means

$\begin{gathered} 6\%\times36.50 \\ =\frac{6}{100}\times36.50 \\ =\frac{6\times36.50}{100} \\ =\frac{219}{100} \\ =2.19\text{ dollars} \end{gathered}$

Now, we will add this $2.19 to the initial cost, we have

$2.19+36.50=38.69$

This gives $38.69.

Finally we will do a discount of 10%. 10% discount is

$\begin{gathered} 10\%\times38.69 \\ \frac{10}{100}\times38.69 \\ =\frac{10\times38.69}{100} \\ =\frac{386.9}{100} \\ =3.869 \end{gathered}$

We will then subtract this 3.869 from 38.69, we get

$\begin{gathered} 38.69-3.869 \\ =34.821 \end{gathered}$

That is 34.821. The 1 which is the last number at the decimal part is less than 5, so we ignore it and our answer becomes $34.82

3 0

2 years ago

Solve 5.3×0.5 and show work

Inga [223]

5.3 * 0.5 = 2.65
5.3/2=2.65

8 0

3 years ago

Melons cost $20 pet Crate, and apples cost $8 per create. an order comes in for a total of 48 crates for $420. what was the numb

Alika [10]

Answer:

The number of melon was 3 and the number of apples was 45.

Step-by-step explanation:

1. Melons cost $20 per crate and apples cost $8 per create. If the total was 48 crates for $420, you can make the following system of equations, where $x$ is the number of melons and $y$ is the number of apples:

$\left \{ {{x+y=48} \atop {20x+8y=420}} \right.$

2. By applying the Method of substitution, you can solve for $y$ in the first equation and substitute it into the second one to find $x$ . Then, you can substitute the value of $x$ into the first equation to find $y$ :

$y=48-x$