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jenyasd209 [6]
3 years ago
9

MUST BE CORRECT ANSWER HELP ASAP

Mathematics
1 answer:
Nina [5.8K]3 years ago
6 0

Answer:

40287600 = B. 4 x 10^{7}

Step-by-step explanation:

<u>We first have to do the multiplication of the numbers given:</u>

19 * 2,120,400

=> 40287600

<u>Now we have to figure out how many digits are after the number 4:</u>

4, 0 2 8 7 6 0 0

7 digits

Meaning that we need an exponent of 7 for it to be in scientific notation, giving us with the answer B. 4  x 10^{7}

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Three-fifths of the students in a room are girls. One-third of the girls have blond hair. One-half of the boys have brown hair.
yan [13]

Answer:

a. Of all the students, \frac{1}{5} are girls with blond hair.

b. Of all the students, \frac{1}{5} are boys without brown hair.

Step-by-step explanation:

a. You know that \frac{3}{5} of the students are girls (This means that \frac{2}{5} of the studes are boys) and \frac{1}{3} of these girls have blond hair.

Then, \frac{1}{3} of \frac{3}{5} is:

(\frac{3}{5})(\frac{1}{3})=\frac{1}{5}

Therefore, of all the students, \frac{1}{5} are girls with blond hair.

b. You know that \frac{1}{2} of the boys have brown hair.

Then, \frac{1}{2} of \frac{2}{5} is:

(\frac{2}{5})(\frac{1}{2})=\frac{1}{5}

Of all the students, \frac{1}{5} are boys without brown hair.

8 0
3 years ago
I bought a new hat for $32. What would be 5% sales tax?
vodka [1.7K]

Answer:

$1.60 for tax, $33.60 all together

Step-by-step explanation:

32 x .05 = 1.6

4 0
3 years ago
Read 2 more answers
What is the sum of the series 3,---5,-13..........-229
Tpy6a [65]

ANSWER

S_{30}= - 3390

EXPLANATION

The given sequence is

3,-5,-13,.....-229.

The first term of this sequence is

a_1=3

There is a common difference of

d =  - 5 - 3 =  - 8

The last term of this sequence is -229.

The nth term of this sequence is given by:

a_n=a_1+d(n-1)

We use the last term to determine the number of terms in the sequence.

- 229 = 3 +  - 8(n - 1)

- 229  - 3=  - 8(n - 1)

- 232=  - 8(n - 1)

Divide through by -8;

29= (n - 1)

n = 30

Hence there are thirty terms in the sequence.

The sum of the first n terms is given by:

S_n= \frac{n}{2} ( a_{1} + l)

The sum of the first 30 terms is given by:

S_{30}= \frac{30}{2} ( 3 +  - 229)

S_{30}=15(  - 226)

S_{30}= - 3390

4 0
3 years ago
Find the axis of symmetry for the quadratic y=6x +12x+20
USPshnik [31]
It’s not a conic section so there’s no axis of symmetry
7 0
3 years ago
How many grams are in 8 fluid ounces
WITCHER [35]

there are 226.796 grams in 8 ounces

6 0
3 years ago
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