What is the proportion for 105/280=x/8

3

Step-by-step explanation:

we know that product do extreme is equal to the product of means

105:280::x:8

105*8=280x

840=280x

x=840/280

x=3

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm