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3 years ago

Which property would allow you to use mental computation to simplify the problem 23 + (7 + 9)?

Mathematics

1 answer:

katrin2010 [14]3 years ago

3 0

Distributive property

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Find the product mentally using distributive property 3 x 78 solve this problem :}

Rainbow [258]

Answer:

234

Step-by-step explanation:

3 x 78= 3 x 70 + 3 x 8

210 + 24

=234

5 0

3 years ago

Read 2 more answers

How to solve through elimination the following 2m=-4n-4 and 3m+5n=-3

lesya692 [45]

$2m=-4n-4 \ \ \ |\times (-3) \\
3m+5n=-3 \ \ \ |\times 2 \\ \\
-6m=12n+12 \\
\underline{6m+10n=-6} \ \ \ |\hbox{add the sides of the equations} \\
10n=12n+12-6 \\
10n=12n+6 \ \ \ |-12n \\
-2n=6 \ \ \ |\div (-2) \\
n=-3 \\ \\
2m=-4n-4 \\
2m=-4 \times (-3)-4 \\
2m=12-4 \\
2m=8 \ \ \ |\div 2 \\
m=4 \\ \\
(m,n)=(4,-3)$

3 0

3 years ago

3. Kyle starts with $15.00 and saves $3.50

Lera25 [3.4K]

Answer:

C 3.5t + 15, where t is the number

of days

5 0

3 years ago

Find the volume of the composite figure shown

Lelu [443]

Answer:

480 inches^3

Step-by-step explanation:

The volume of a Prism is: Bh

B= length of the base

h= height of the lateral face

(8*10)4

320 inches^3

So for the 2nd figure on top you do the same.

This time you divide by 2.

So it's 160 inches^3.

Add up you get a sum of 48- inches^3.

Or 480 cubic inches.

5 0

3 years ago

What is the total surface area of the box formed by the pattern below

nadezda [96]

Answer:

<h2>The total surface area of the box is 224 square inches.</h2>

Step-by-step explanation:

The box pattern is shown in the image attached.

The total surface is the sum of the area of each section of the figure, which is formed by 4 equal rectangles and 2 equal squares. Rectangles have dimensions of 12 inches by 4 inches, and squares have 4 inches per side.

So, the total surface would be

$S_{total}=S_{squares} +S_{rectangles}\\ S_{total}=2(4in)^{2} +4(12in \times 4 in)\\ S_{total}=2(16in^{2})+4(48in^{2} ) \\ S_{total}=32in^{2}+192in^{2}\\ S_{total}=224in^{2}$

Therefore, the total surface area of the box is 224 square inches.

8 0

4 years ago