Question

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Answer 1

Answer:

Q.4 65

Step-by-step explanation:

SUM OF CIRCLE

$sum \: of \: cirlcle \: is \: 360 \\ then \: we \: can \: easly \: calculate \: \\ 130 + 50 + 40 + (2y + 10) = 360 \\ put \: y \: = 65 \: \\ then \: \\ 2 \times 65 + 10 = 140 \\130 + 50 + 40 + 140 = 360 \\ y = 65$

Answer 2

Step-by-step explanation:

Q.3 The zero of the polynomial p(x) = 2x + 5 is :

A.3 We have,

⇒ P(x) = 2x + 5

Let p(x) = 0

Zero of the polynomial is the x-intercept, so to find zero we take x as 0.

⇒ 2x + 5 = 0

⇒ 2x = -5

⇒ x = -5/2

∴ Zero of the polynomial p(x) = 2x + 5 is -5/2.

Q.4 Find the value of y in the following figure.

A.4 We have,

⇒ Angle's measures :

• (2y + 10)°
• (50)°
• (40)°
• (130)°

We know,

Sum of all the angles around a point  is equal to 360°.

So,

⇒ (2y + 10)° + (50)° + (40)° + (130)° = 360°

⇒ 2y + 10 + 50 + 40 + 130 = 360°

⇒ 2y + 230° = 360°

⇒ 2y = 130°

⇒ y = 130°/2

⇒ y = 65°

∴ The value of y° is b) 65°.

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