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katovenus [111]
3 years ago
5

Please help, Thanks.

Mathematics
1 answer:
Evgen [1.6K]3 years ago
8 0

Answer:

C

Step-by-step explanation:

49x² + 28xy + 4y² ← is a perfect square of the form

(ax + by)² = a²x² + 2abxy + b²y²

49 = 7² ⇒ a = 7 and 4 = 2² ⇒ b = 2

2ab = 2 × 7 × 2 = 28

Hence

49x² + 28xy + 4y² = (7x + 2y)²

with factor 7x + 2y ⇒ C

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Step-by-step explanation:

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3 years ago
If x2-y2 = 10 and x+y = 5, what is the value of x-y? 2-5?
netineya [11]

Answer:

x-y=2

I don't get why they are asking you what is 2-5. That seems super basic compared to the other question it is with. Since 5-2=3, then 2-5 or -5+2=-3.

Step-by-step explanation:

We are going to use identity x^2-y^2=(x-y)(x+y)

x^2-y^2=10

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8 0
3 years ago
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Monica [59]

Answer:

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Step-by-step explanation:

Simplifying

74 + 2x = 0

Solving

74 + 2x = 0

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74 + -74 + 2x = 0 + -74

Combine like terms: 74 + -74 = 0

0 + 2x = 0 + -74

2x = 0 + -74

Combine like terms: 0 + -74 = -74

2x = -74

Divide each side by '2'.

x = -37

Simplifying

x = -37

6 0
2 years ago
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Lemur [1.5K]

Answer:

Mrs. Snitch will leave a tip of $8.40.

Step-by-step explanation:

$8.40 is 15% 0f 56.00.

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