Question

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Answer 1

Step-by-step explanation:

1.a)

$2(y + 7) = 3(y - 10)$

$2y + 14 = 3y - 30$

$2y - 3y = - 30 - 14$

$- y = - 44$

$y = 44$

b)

$\frac{3x - 4}{5} = \frac{2x + 4}{2}$

Using cross multiplication,

$5(2x + 4) = 2(3x - 4)$

$10x + 20 = 6x - 8$

$10x - 6x = - 8 - 20$

$4x = - 28$

$x = - \frac{28}{4}$

$x = - 7$

3) Circumference of a circle = 88cm.

$2\pi \: r = 88$

$2 \times \frac{22}{7} \times r = 88$

$\frac{44}{7} \times r = 88$

$r = 88 \times \frac{7}{44}$

$r = 2 \times 7$

$r = 14$

Radius = 14 cm.

Diameter of a circle = 2 * radius

= 2 * 14 cm

= 28 cm.

Answer :- Diameter of a circle is 28 cm.

Answer 2

Answer:

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