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Afina-wow [57]
3 years ago
8

How can you use mental math and properties to help you multiply numbers?

Mathematics
1 answer:
inessss [21]3 years ago
4 0
<span>You can use mental math to help you multiply numbers by using the distributive property to divide it easily and then add them up to get a quick answer. You can also use mental math by using the commutative property as a quick reminder. If you have 7 + 10 and the next problem is 10 + 7, you know the answer will be the same, 17.</span>
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Hi I don't know how to do this
Elena-2011 [213]

Using a system of equations, the weight of 5 apples, 2 oranges are 4 bananas is given as follows:

B. 1147 gm.

<h3>What is a system of equations?</h3>

A system of equations is when two or more variables are related, and equations are built to find the values of each variable.

In this problem, the variables are:

  • Variable x: Weight of an apple.
  • Variable y: Weight of an orange.
  • Variable z: Weight of a banana.

Considering the data given, the equations are:

  • 3x + 5y = 928.
  • 4y + 6z = 1088.
  • 5x + 3z = 799.

From the first equation:

3x = 928 - 5y.

x = 309.33 - 1.667y.

From the second equation:

6z = 1088 - 4y

z = 181.33 - 0.667y

Replacing in the third equation:

5x + 3z = 799

5(309.33 - 1.667y) + 3(181.33 - 0.667y) = 799

10.336y = 12961.64

y = 1291.64/10.336

y = 125 gm.

The other weights are:

  • x = 309.33 - 1.667y = 309.33 - 1.667 x 125 = 101 gm.
  • z = 181.33 - 0.667y = 181.33 - 0.667 x 125 = 98gm.

The weight of 5 apples, 2 oranges are 4 bananas is:

5x + 2y + 4z = 5 x 101 + 2 x 125 + 4 x 98 = 1147 gm, option B.

More can be learned about a system of equations at brainly.com/question/24342899

#SPJ1

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Tìm x <br><br>a,(2x+3x)^2-4x^2=10<br><br>b,(x+2)^-(x-2)(x+1)=3<br><br>c,(2x+3)^-4(x-1)^2=0
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Will mark brainliest if your are correct!
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Step-by-step explanation:

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