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Mice21 [21]
3 years ago
11

PLZZZZ HELP!! D:

Mathematics
1 answer:
liubo4ka [24]3 years ago
8 0

For number 2 I think it’s B but I am not sure

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3x-4 or = to 7<br><br><br> plz help
lisabon 2012 [21]

Answer:

3 + 4 = 7  which is true.

Step-by-step explanation:

Whenever you have an equation with a plain variable (that is, no exponent included), there is only one number that will work when substituted for x.

To solve it, you have to "undo" what is done to the variable. You also go in the reverse order of operations, so you do the addition/subtract first, then multiplication/division.

You also have to do the same to both sides, kind of like keeping a balance scale in balance.

In this case, we subtract 4 from both sides first:

3x + 4 -4 = 7 - 4

The + 4 - 4 cancel each other out, so you get:

3x = 3

3x means "3 times x" so you divide by 3 to undo it. I will use the / to indicate division:

3x / 3 = 3 /3  

so 1x = 1.

Since 1x is "1 times x" it is the same as x by itself, so:

x=1

AND, if we substitute 1 back into the original equation (the asterisk stands for multiply):

3 * 1 + 4 = 7

3 * 1 is 3, so:

3 + 4 = 7     which is true.

1 is the only number that works.

Hope this helped.

3 0
2 years ago
Read 2 more answers
Matthew bought a suitcase marked down from $90 to $81. What is the discount percentage?
Ksivusya [100]

Answer:

10%

Step-by-step explanation:

Percent change= New-Old |Old|× 100% percent change=81-90 |90| × 100= -9 90×100=-10%

7 0
2 years ago
PLEASE HELP The areas of two similar triangles are 50 dm2, and 32 dm2. The sum of their perimeters is 117 dm. What is the perime
Novosadov [1.4K]

Answer:

65 dm and 52 dm

Step-by-step explanation:

If the scale factor of the sides is k, then the scale factor of the areas is k^2.

The scale factor of the areas is (32 dm^2)/(50 dm^2) = 0.64 = k^2

The scale factor of the sides is k = \sqrt(0.64) = 0.8

The perimeters are in a ratio of 1:0.8

x + 0.8x = 117

1.8x = 117

x = 65

0.8x = 0.8(65) = 52

The perimeters are 65 dm and 52 dm.

4 0
3 years ago
If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its radius is:
andrey2020 [161]

Answer:

6

Step-by-step explanation:

The number on the right side of the equal side represents the radius, HOWEVER, it is squared, therefore you must square root it to get 6

5 0
3 years ago
What does a markdown in math mean?
oee [108]
A markdown in math is basically a decrease in whatever numbers you are working with. 
5 0
3 years ago
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