HELP! 70 POINTS!!!

Mathematics

1 answer:

skad [1K]3 years ago

8 0

Answer:

Question A: They should add product B because it has a 69% rate of approval. They can be 69% confident that the addition of product B will be successful.

Question B: 31% of people would prefer cookie A over cookie B

Step-by-step explanation:

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What is the answer??

kykrilka [37]

Answer:

Step-by-step explanation:

Let AC = x

AB - AC = 4 cm

AB = 4 +x ----------------(I)

Pythagorean theorem

AB² + AC² =BC²

(4 + x)² + x² = 9²

Use the identity (a + b)² = a² + 2ab + b² where a = 4 & b = x

4² +2*4*x +x² + x²= 81

16 + 8x + 2x² = 81

2x² + 8x + 16 - 81 = 0

2x² + 8x - 65= 0

a = 2 ; b = 8 ; c = -65

D = b² - 4ac

= 8² - 4*2*(-65)

= 64 + 520

D = 584

√D = √584 = 24.16

$x=\frac{-b+\sqrt{D}}{2a} \ or \ x =\frac{-b-\sqrt{D}}{2a}\\\\x= \frac{-8+24.16}{2*2} \ or \ x = \frac{-8-24.6}{2*2}$ {Ignore this as it is negative.}