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borishaifa [10]
2 years ago
12

HELP ME PLEASEEEEEEEE

Mathematics
2 answers:
stepladder [879]2 years ago
8 0

Answer:

x = 21

Step-by-step explanation:

3x + 18 + 4x + 15 = 180

7x + 33 = 180

7x = 147

x = 21

krek1111 [17]2 years ago
7 0

Answer:

x = 21

Step-by-step explanation:

3x + 18 + 4x + 15 =180

7x + 33 = 180

7x = 147

x = 21

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X+y+z=2<br> 2x+y-z=5<br> X-y+z=-2
Debora [2.8K]

Answer:

x=2-y-z

x=5/2-y/2+z/2

x=-2+y-z

5 0
2 years ago
Robin read 63 books last year. She read 9 more books than
Stolb23 [73]

Answer: 54

Step-by-step explanation:

63-9 you can't take 9 away from 3 so you must borrow, the 6 becomes a 5 and the 3 becomes 13. 13-9 is 4, bring the 5 down and you have 54.

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3 years ago
Which trinomials are perfect square trinomials?
taurus [48]
You can know a perfect square trinomial:

i) if the coefficient of a² = 1.

ii) If you divide the middle number coefficient by 2 and you square it you get the last term.

Take for example the first option: 

For all the options, the coefficient of a² = 1

a² + 4a + 16.

Coefficient of a = 4.
4/2 = 2
2² = 4, this does not equal the last term so it is not a perfect square trinomial.


a² + 14a + 49.

Coefficient of a = 14.
14/2 = 7
7² = 49, this is equal the last term so it is a perfect square trinomial.
And the perfect square is (a +7)²


Similarly if you test the last option.

a² + 26a + 169.

Coefficient of a = 26.
26/2 = 13
13² = 169, this is equal the last term so it is a perfect square trinomial.
And the perfect square is (a +13)²

So the only two options are: a² + 14a + 49 and a² + 26a + 169.

Other options do not pass this test.
3 0
2 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
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no hablo , lo siente

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3 years ago
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