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3 years ago

The work of a student to solve a set of equations is shown:

Mathematics

1 answer:

butalik [34]3 years ago

8 0

Step 2! The reason for that is the student didnt multiplied (15-2z) with -2. But she should have!

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2 years ago

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One-third of a number is 1 more than one-fourth of the same number.<br> What is the number?

konstantin123 [22]

Answer:

Step-by-step explanation:

1/3 of 12 = 4

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The number is 12.

_____

If this does not immediately come to mind, you can solve for the number, x:

x/3 -x/4 = 1 . . . . the difference between 1/3 of x and 1/4 of x is 1

x/12 = 1 . . . . . . . collect terms: (1/3 -1/4 = 4/12 -3/12 = 1/12)

x = 12 . . . . . . . . multiply by 12

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3 years ago

-20x2 + x + 12<br> Factor

Pavel [41]

Answer:

[x-3] [x+4]

Step-by-step explanation:

You look to see if you spot the appropriate factors strait away. If you can not immediately determine them you have to consider all of the potential ones and reason out which ones work.

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