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3 years ago

I needs hheeellllppppp

Mathematics

1 answer:

Step2247 [10]3 years ago

5 0

Answer:

It's C.7

Step-by-step explanation:

Use the foil method

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A cafe bookshop also has bakery products in their menu. The owner wants to know whether bakery sales are associated with an incr

tiny-mole [99]

Answer:

Step-by-step explanation:

null hypothesis will be book sales are related to bakery sales.

We reject null hypothesis if we do not have statistical evidence that there is significant relationship between book sales and bakery sales.

6 0

3 years ago

Solve the system of linear equations by elimination.<br><br> x+4y=1<br> 3x+5y=10

laiz [17]

Answer:

x = 5 , y = -1

Step-by-step explanation:

Solve the following system:

{4 y + x = 1 | (equation 1)

5 y + 3 x = 10 | (equation 2)

Swap equation 1 with equation 2:

{3 x + 5 y = 10 | (equation 1)

x + 4 y = 1 | (equation 2)

Subtract 1/3 × (equation 1) from equation 2:

{3 x + 5 y = 10 | (equation 1)

0 x+(7 y)/3 = -7/3 | (equation 2)

Multiply equation 2 by 3/7:

{3 x + 5 y = 10 | (equation 1)

0 x+y = -1 | (equation 2)

Subtract 5 × (equation 2) from equation 1:

{3 x+0 y = 15 | (equation 1)

0 x+y = -1 | (equation 2)

Divide equation 1 by 3:

{x+0 y = 5 | (equation 1)

0 x+y = -1 | (equation 2)

Collect results:

Answer: {x = 5 , y = -1

6 0

3 years ago

Read 2 more answers

Solve the trigonometric equation in the interval [0, 2π). Give the exact value, if possible; otherwise, round your answer to two

svp [43]

Answer:

θ∈{ $\frac{\pi }{8},\frac{5\pi }{8},\frac{9\pi }{8},\frac{13\pi }{8}$ }

Explanation:

The given equation is

$sin(2\theta )-cos(2\theta )=0$

$\Rightarrow sin(2\theta )=cos(2\theta )\\\\\therefore \frac{sin(2\theta )}{cos(2\theta )}=1\\\\tan(2\theta )=1\\\\\therefore 2\theta =n\pi +\frac{\pi}{4}\\\\\therefore \theta =\frac{n\pi }{2}+\frac{\pi }{8}$

Applying values on 'n' we obtain values of θ that beling to [0,2π)

For n=0, θ= $\frac{\pi }{8}$

For n=1, θ = $\frac{5\pi }{8}$

For n=2,θ = $\frac{9\pi }{8}$

For n=3,θ = $\frac{13\pi }{8}$

6 0

4 years ago

( 13points)Help!!!

sammy [17]

Answer:

I believe your answer should be D. I am so sorry if it's wrong but it makes the most sense to my eyes. Hope it helps <3

7 0

3 years ago

What is the missing statement in the proof? Scroll down to see the entire proof.

Eva8 [605]

Answer: C. $\angle BCA\cong \angle DCB$ is the missing statement.

Explanation: Given: ΔABC with m∠ABC = 90° (view diagram)

Prove: $AB^2 + BC^2 = AC^2$

Proof: 1. Draw $BD\perp AC$ (construction)

2. $\angle ABC\cong\angle BDC$ (Angles with the same measure are congruent.)

3. $\angle BCA\cong \angle DCB$ (Reflexive Property of Congruence)

4. $\triangle ABC\sim \triangle BDC$ (AA criterion for similarity)

5. BC:DC=AC:BC (Corresponding sides of similar triangles are proportional.)

6. $BC^2= AC\times DC$ (cross multiplication)----------(1)

7. $\angle ABC\cong \angle ADB$ (Angles with the same measure are congruent)

8. $\angle BAC\cong \angle DAB$ (Reflexive Property of Congruence)

9. $\triangle ABC\sim \triangle ADB$ (AA criterion for similarity)

10. AB:AD=AC:AB⇒ $AB^2=AC.AD$ --------------(2)

equation (1) + equation (2) ⇒ $AB^2+BC^2= AC(DC+AD)$ ⇒ $AB^2+BC^2= AC^2$

6 0

3 years ago

Read 2 more answers