Questions

Primary productivity refers to plants that make their own food using sunlight, water and availability of nutrients. Hence, they are not limited by time.

Garbage burning is common in rural areas, but it poses health concerns and hazards to the environment. It especially affects people with sensitive respiratory systems, as well as children and the elderly.

Benefits ::

• It produces methane that can be used like natural gas.
• It partially addresses the solid waste disposal problem.
• It provides biomass energy.

Hence, it creates more space for farming is not the benefit of the burning garbage.

A spreadsheet is an interactive computer application for organization, analysis and storage of data in tabular form. This software allows users to store data in rows and columns.

SY Quraishi

The South African leg-spinner has become the 1st-ever spinner to bowl the 1st over in a World Cup. It took place in the World Cup 2019 against England team at Oval in London where he bowled Bairstow for a DUCK.

Let the missing numbers be x, y, a and b

x + y = 8 ---- (1)
a - b = 6 ---- (2)
x + a = 13 --- (3)
y + b = 8 ---- (4)

2x + a + y = 21 --- From (1 & 3)
a + y = 14 ----  From (2 & 4)

Substitute (2 & 4) in (1 & 3)

2x + 14 = 21
2x = 7
x = 3.5

From (1) ---> 3.5 + y = 8
=> y = 8 - 3.5 = 4.5

a + y = 14 => a = 14 - y = 14 - 4.5 => a = 9.5
From (4) ---- y + b = 8 => b = 8 - y = 8 - 4.5 = 3.5

Hence,
x = 3.5
y = 4.5
a = 9.5
b = 3.5