exam Maths Puzzle Numerical Ability

please help me solve these inequalities with solutions in interval notation:

[x+5]>=10

[x/2]>=8

[x]+5<=10

[x-5]<10

[2x]>=8

3[x-1]+7>25

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exam Other Question

the length of a rectangle is three times its width
theperimeter of the rectangle is56 cm
a find the length and width of the rectangle

b find the area of the rectangle.

how do i do this please
the sum of two numbers is 12. three times the product of the numbers is 105. what re the twoo numbers?