Question

The pair of linear equations y = 0 and y =-5 has

(a) One solution

(b) Two solutions

(c) Infinitely many solutions

(d) No solution​

Answer 1

a) One solution

Hope it helps you !!

Answer 2

Answer:

❖ᴏɴʟʏ ᴘʀᴏᴘᴇʀ ꜱᴏʟᴠᴇᴅ ᴀɴꜱᴡᴇʀ ᴡɪᴛʜ ɢᴏᴏᴅ ᴇxᴘʟᴀɴᴀɪᴏɴ ɴᴇᴇᴅᴇᴅ

❖ ɴᴏ ꜱᴘᴀᴍᴍɪɴɢ

❖ᴏɴʟʏ ꜰᴏʀ ᴍᴏᴅᴇʀᴀᴛᴏʀꜱ, ʙʀᴀɪɴʟʏ ꜱᴛᴀʀꜱ ᴀɴᴅ ᴏᴛʜᴇʀ ʙᴇꜱᴛ ᴜꜱᴇʀꜱ

Step-by-step explanation:

The radius of the inner circle is 14cm.

Step-by-step explanation:

Let the radius of the inner circle = r

Given :

Area enclosed between two concentric circles , A = 770 cm²

Radius of the outer circle, R = 21cm

Area enclosed between two concentric circles, A = Area of the Outer circle – Area of the inner circle

770 = πR² – πr²

770 = π(R² - r²)

770 = π(21² – r²)

770 = π(441 - r²)

770 = 22/7 (441 - r²)

770 × 7 = 22(441 - r²)

(441 - r²) = 770 × 7 / 22

(441 - r²) = (70 × 7)/2

(441 - r²) = 35 × 7

245 = 441 – r²

r² = 441 – 245

r² = 196

r = √196

r = 14

r = 14cm

Hence, the radius of the inner circle is 14cm.

HOPE THIS ANSWER WILL HELP YOU….