1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
olga2289 [7]
3 years ago
13

(2.5×10^−10)(7×10^−6)

Mathematics
1 answer:
Nataly [62]3 years ago
6 0
<span>(2.5×10^−10)(7×10^−6) 
= (2.5 x 7) (</span>10^−10 x 10^−6)
= 17.5 x 10^-16
= 1.75 x 10^-15

answer
<span>B. 1.75×10^−15 </span>
You might be interested in
I need help!<br> I need this today!
larisa [96]

Answer:

Yes.

Step-by-step explanation:

It is because 75=9

Hope This Helps.:)

3 0
2 years ago
If 23 people shake each others hands once how many hands are shook in all
AURORKA [14]
This is the number of combinations of 2 from 23
 23C2   = 23! / 2! 21!

A quick way to do this   is  23*22 / 2   =   253
7 0
3 years ago
A book has 500 pages numbered 1,2,3 and so on. How many times does the digit 1 appear in the page numbers?
elena-14-01-66 [18.8K]

Answer:

200

Step-by-step explanation:

This book has 500 pages in total.

We should split up the place values.

1 - 9

One only appears once.

1

10 - 19

One appears 11 times.

1 + 11

20 - 99

One only appears 8 times.

1 + 11 + 8

Add:

1 + 11 + 8

=> 20

Since the same is for  200-299, and so on. Let us add twenty four times.

20 * 4

=> 80

Looking back to 100-199, there are 120 ones.

Add:

120 + 80

=> 200

4 0
3 years ago
A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 4 ft/s along
mina [271]

Answer:

The tip of the man shadow moves at the rate of \frac{20}{3} ft.sec

Step-by-step explanation:

Let's draw a figure that describes the given situation.

Let "x" be the distance between the man and the pole and "y" be distance between the pole and man's shadows tip point.

Here it forms two similar triangles.

Let's find the distance "y" using proportion.

From the figure, we can form a proportion.

\frac{y - x}{y} = \frac{6}{15}

Cross multiplying, we get

15(y -x) = 6y

15y - 15x = 6y

15y - 6y = 15x

9y = 15x

y = \frac{15x}{9\\} y = \frac{5x}{3}

We need to find rate of change of the shadow. So we need to differentiate y with respect to the time (t).

\frac{dy}{t} = \frac{5}{3} \frac{dx}{dt} ----(1)

We are given \frac{dx}{dt} = 4 ft/sec. Plug in the equation (1), we get

\frac{dy}{dt} = \frac{5}{3} *4 ft/sect\\= \frac{20}{3} ft/sec

Here the distance between the man and the pole 45 ft does not need because we asked to find the how fast the shadow of the man moves.

7 0
3 years ago
These two figures are similar. Find the length of side y.
TiliK225 [7]
3.2 is the Length of y 7.5 is the length of z and the length of x is 12.5
6 0
2 years ago
Other questions:
  • Write and solve a real world problem involving the multiplication of a fraction and a whole number whose product is between 10 a
    8·1 answer
  • Jensen and Raju had the same amount of money at first. After Jensen spent
    14·1 answer
  • How to do Imaginary number
    10·1 answer
  • What is the value of sin 0 given that (-3,7) is a point on the terminal side 0
    15·1 answer
  • Use the distributive property to fill in the blanks below.<br>(9 x 8) - (9 * 5) = [] (8 - 5)​
    13·1 answer
  • What are major turning points in algebraic knowledge through out history
    13·1 answer
  • What two of the same numbers equal to 112
    9·1 answer
  • Is 9 correct if now what is it?
    6·1 answer
  • I really hope I get help from y’all
    7·1 answer
  • F(x) = x/2 - 3 and g(x) = 3x² + x − 6, find (f+ g)(x)
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!