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
Finger [1]
3 years ago
11

How can you use doubles when multiplying with 4 to find 4x8

Mathematics
1 answer:
pshichka [43]3 years ago
4 0
4 = 2 * 2

Multiplying by 2 is the same a doubling.
Since 4 is 2 * 2, to multiply a number by 4, double the number twice.

Example:
What is 4 * 100?
Double 100 to get 200.
Double 200 to get 400.
Therefore, 4 * 100 = 400.
By doubling twice, we do the same as multiplying by 4.
You might be interested in
The volume of a 10 ounce box of cheerios is 258.75in3. the length of the box is 4 inches less than the height and the width is 3
Marina86 [1]

Answer:

Height of the box = 11.5 in

Step-by-step explanation:

Let h be the height of the box.

Assuming the volume of the Box is 258.75\ in^3.

Given:

Length = Height - 4 = h - 4

Width = 3 in

We need to find the height of the box.

Solution:

We know that the volume of the box.

Volume = Length\times height\times width

Substitute all given value in above formula.

258.75 = (h-4)\times h\times 3

Rewrite the equation as:

258.75 = 3h(h-4)

258.75 = 3h^2-12h

3h^2-12h-258.75=0

whole equation divided by 3.

h^2-4h-86.25=0

Use quadratic formula with a = 1, b = -4,c=-86.25

h=\frac{-b\pm \sqrt{(b)^{2}-4ac}}{2a}

Put these a, b and c value in above equation.

h=\frac{-(-4)\pm \sqrt{(-4)^{2}-4(1)(-86.25)}}{2(1)}

h=\frac{4\pm \sqrt{16+345}}{2}

h=\frac{4\pm \sqrt{361}}{2}

h=\frac{4\pm 19}{2}

For positive sign

h=\frac{23}{2}  

h = 11.5 in

For negative sign

h=\frac{-15}{2}

h = -7.5

We take positive value of h.

Therefore, the height of the box h = 11.5 in

4 0
2 years ago
Daniel left a $9 tip for the waiter at a restaurant. If the tip was 15 percent of the bill, how much was the bill?
Pie
Without the tip it was $60. If you are being asked to add the tip it will be $69
5 0
3 years ago
A scale factor that is less than 1, but greater than 0 is​
swat32

Since the scale factor is smaller than one (the original), the resulting image is smaller than the original.

Hope this helped, and feel free to ask more questions if needed(:

7 0
2 years ago
Read 2 more answers
The perimeter of the triangle
Illusion [34]
Area=228 feet sqa.
Length=12 ft.
Breadth=(228/12) ft.
=19 ft.
Perimeter=2(12+19) ft.
=2×31 ft.
=62 ft.

HOPE IT HELPS UH!!☺️☺️
8 0
3 years ago
Help to answer this question?
rosijanka [135]

Answer:

No, Victoria doesn't have enough. She doesn't have enough because 15% off of 139.99 is 118.99. But then their is a 7% sales tax. So once you add the sales tax you get $127.32 and her max is $125.

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • Which best describes a triangle with side lengths of 6in 8in and 9in ​
    8·2 answers
  • PLZ HELP!!!!<br> I will mark u the brainyest!!!answer only 1-4 questions!!
    15·1 answer
  • HELP PLEASE<br><br> Simplify the expression where possible. (-5x 2) 3
    7·1 answer
  • What times what is equals 455 in prime numbers
    9·1 answer
  • Isaac And his brother and sister Jake,Rosie was playing on the Xbox one Isaac spend 12x13 dollar on a game jake spend 52x12 in a
    8·2 answers
  • WELP
    10·1 answer
  • 540 less than the product of 54 and a number is 918.<br> What is the answer?
    9·2 answers
  • If the input value is 4, what is the output value for the following function?
    11·1 answer
  • How do i factorize x2+14x+49
    12·2 answers
  • Can someone solve this math problem for me
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!