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
DaniilM [7]
3 years ago
7

Explain how to find 40×50 using mental math

Mathematics
2 answers:
Naya [18.7K]3 years ago
7 0
Multiply 4 * 5, which equals 20, and add the two zeroes(from 40 and 50) on the end.

That gives us:

2000
Reptile [31]3 years ago
6 0
Multiply 4 X5 which equals 20 then add two zeros because 40 has one zero and 50 has one zero hope that helps
You might be interested in
Calculate the perimeter of the following parallelogram:<br> 10 in<br> 4 in<br> 3 in
Furkat [3]
3 because when you catch
5 0
3 years ago
Read 2 more answers
Solve the equation<br> -3x + 1 + 10x = x + 4<br> 0 x = 1/2<br> х<br> =<br> x = 12<br> X = 18
pav-90 [236]

Answer:

<h3>            x = 1/2</h3>

Step-by-step explanation:

-3x + 1 + 10x = x + 4

      -1                  -1

        7x  = x  + 3  

       -x          -x

        6x = 3

      ÷6      ÷6

         x = 1/2

8 0
3 years ago
Find the unit rate.<br> 80 rooms on 5 floors<br> =<br> =<br> rooms per floor<br> Submit
Ganezh [65]
<h3>The formula to find unit rate is:</h3>

<em>divide the denominator with the numerator in a way that the denominator becomes 1</em>

<h2>Now,</h2>

\begin{gathered}\\ \sf\longmapsto \frac{80}{5}\end{gathered}

\begin{gathered}\\ \sf\longmapsto\cancel{\dfrac{80}{5}} \end{gathered}

\begin{gathered}\\ \sf\longmapsto 16\end{gathered}

<u>Hence, The unit rate is 16 rooms per floor.</u>

6 0
2 years ago
Read 2 more answers
What is the area of the composite figure?<br> units
Pani-rosa [81]

Answer:

Step-by-step explanation:

You have to decompose the figure. Cut it into different sections like squares, triangles, and rectangles so you can find the area. Once you have decomposed it, multiply the sides of each section to find the separate area of each  square, triangle, rectangle, etc then add up those areas.

3 0
3 years ago
Read 2 more answers
There is a line through the origin that divides the region bounded by the parabola y=2x-4x^2 and the x-axis into two regions wit
shtirl [24]
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

y = 7x - 4x² 

<span>7x - 4x² = 0 </span>

<span>x(7 - 4x) = 0 </span>

<span>x = 0, 7/4 </span>

<span>Find the area of the bounded region... </span>

<span>A = ∫ 7x - 4x² dx |(0 to 7/4) </span>

<span>A = 7/2 x² - 4/3 x³ |(0 to 7/4) </span>

<span>A = 7/2(7/4)² - 4/3(7/4)³ - 0 = 3.573 </span>

<span>Half of this area is 1.786, now set up an integral that is equal to this area but bounded by the parabola and the line going through the origin... </span>

<span>y = mx + c </span>

<span>c = 0 since it goes through the origin </span>

<span>The point where the line intersects the parabola we shall call (a, b) </span>

<span>y = mx ===> b = m(a) </span>

<span>Slope = m = b/a </span>

<span>Now we need to integrate from 0 to a to find the area bounded by the parabola and the line... </span>

<span>1.786 = ∫ 7x - 4x² - (b/a)x dx |(0 to a) </span>

<span>1.786 = (7/2)x² - (4/3)x³ - (b/2a)x² |(0 to a) </span>

<span>1.786 = (7/2)a² - (4/3)a³ - (b/2a)a² - 0 </span>

<span>1.786 = (7/2)a² - (4/3)a³ - b(a/2) </span>

<span>Remember that (a, b) is also a point on the parabola so y = 7x - 4x² ==> b = 7a - 4a² </span>
<span>Substitute... </span>

<span>1.786 = (7/2)a² - (4/3)a³ - (7a - 4a²)(a/2) </span>

<span>1.786 = (7/2)a² - (4/3)a³ - (7/2)a² + 2a³ </span>

<span>(2/3)a³ = 1.786 </span>

<span>a = ∛[(3/2)(1.786)] </span>

<span>a = 1.39 </span>

<span>b = 7(1.39) - 4(1.39)² = 2.00 </span>

<span>Slope = m = b/a = 2.00 / 1.39 = 1.44</span>

7 0
3 years ago
Other questions:
  • Given a positive integer n, assign true to is_prime if n has no factors other than 1 and itself. (remember, m is a factor of n i
    9·2 answers
  • What is the total mass of Sarina's lunch, including her lunchbox, if her sandwich is
    15·1 answer
  • What is the solution to the proportion? Round the answer to the nearest tenth if necessary. StartFraction 52 over x EndFraction
    13·2 answers
  • A taxi charges $3 plus $1.50 for each mile traveled. Mr. Hill rode in the taxi from his home to the airport and was charged $30.
    10·1 answer
  • What does this math problem solve? 1982x6578=_____
    14·2 answers
  • Solve 4x+y=8 x+y=5 Solving by elimination
    13·2 answers
  • Until the scale was changed in 1995, SAT scores were based on a scale set many years ago. For Math scores, the mean under the ol
    5·1 answer
  • Find the value of x
    8·2 answers
  • Which function rule represents the data in the table?
    13·1 answer
  • F(2)=<br> Please help I don’t got time ;-;
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!