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3 years ago

100 POINTS IF YOU GUESS RIGHT PLEASE HELP

Mathematics

1 answer:

soldi70 [24.7K]3 years ago

6 0

Answer:

5 and 3

Step-by-step explanation:

Let the numbers be x and y.

We have:

x + y = 8
x - y = 2

Sum the two and find x:

2x = 10
x = 5

Find y:

y = 5 - 2
y = 3

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Please prove this........

Crazy boy [7]

Answer: see proof below

Step-by-step explanation:

Given: A + B + C = π → C = π - (A + B)

→ sin C = sin(π - (A + B)) cos C = sin(π - (A + B))

→ sin C = sin (A + B) cos C = - cos(A + B)

Use the following Sum to Product Identity:

sin A + sin B = 2 cos[(A + B)/2] · sin [(A - B)/2]

cos A + cos B = 2 cos[(A + B)/2] · cos [(A - B)/2]

Use the following Double Angle Identity:

sin 2A = 2 sin A · cos A

Proof LHS → RHS

LHS: (sin 2A + sin 2B) + sin 2C

$\text{Sum to Product:}\qquad 2\sin\bigg(\dfrac{2A+2B}{2}\bigg)\cdot \cos \bigg(\dfrac{2A - 2B}{2}\bigg)-\sin 2C$

$\text{Double Angle:}\qquad 2\sin\bigg(\dfrac{2A+2B}{2}\bigg)\cdot \cos \bigg(\dfrac{2A - 2B}{2}\bigg)-2\sin C\cdot \cos C$

$\text{Simplify:}\qquad \qquad 2\sin (A + B)\cdot \cos (A - B)-2\sin C\cdot \cos C$

$\text{Given:}\qquad \qquad \quad 2\sin C\cdot \cos (A - B)+2\sin C\cdot \cos (A+B)$

$\text{Factor:}\qquad \qquad \qquad 2\sin C\cdot [\cos (A-B)+\cos (A+B)]$

$\text{Sum to Product:}\qquad 2\sin C\cdot 2\cos A\cdot \cos B$

$\text{Simplify:}\qquad \qquad 4\cos A\cdot \cos B \cdot \sin C$

LHS = RHS: 4 cos A · cos B · sin C = 4 cos A · cos B · sin C $\checkmark$

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3 years ago

which of the following statements about perpendicular lines is true? a. perpendicular lines have a constant distance between the

Flauer [41]

B is the right answer

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4 years ago

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oksano4ka [1.4K]

Answer:

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3 years ago

1.272 divided by 0.003?

icang [17]

Answer:

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Step-by-step explanation:

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3 years ago

Hailey paid $13 for 1 3/7 kg of sliced salami. What was the cost per kilogram of salami?

inna [77]

First lets get the total weight that Hailey bought, that is working with fractions:
1 3/7 = 7/7 + 3/7
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so we use a rule of three to solve this:
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1 kg --------> x
x = (1)(13)/(1.43)
x = 9.09
therefore a 1kg of sliced salami costs $9.09

6 0

3 years ago

Read 2 more answers