Question

Pliss bgt tolongin saya. yg jawab 99999 trims dari saya
sory bhs inggris tpi plisssssss bgt :'(

Estimate each of the following mentally and choose the correct answer in each case
1. 3.14 x 80.5 =
2. ∛998 =

Estimate each of the following and pick the clotest answer in each case
3. 52.47 x 0.083/0.00198 =
4. √0.0895

5.The perimeter of rectangle is 50 cm. The width of the rectangle is 10 cm less than the lenght of the rectangle. Find the length, width and area of the rectangle

Sekilas emang nomor 1 sampai 4 terlihat mudah tapi nomor 5 saya sangat bingung mungkin karena kurang belajar dan kebanyakan main game. ahahaha tolong bantuannya pliss bgt

Answer 1

1.) 3,14 x 80,5 = 314 x 805 x 10⁻² x 10⁻¹ = 252770 x 10⁻³ = 252,77
2.) ∛998 = ∛(8³x1,9) = 8∛(1,9). Pembulatan akan menjadi 8∛2.
3.) 52,47 x 0,083/0,00198 = 52,47 x 83/0,198 = 52,47 x 419,19 = 21994,9
4.) √0,0895 = √(895x10⁻⁴x10⁻¹) = 10⁻²√(89,5) = 0,01√(89,5)
5.) Perimeter = 50cm, width = 10cm less than lenght, so w = l - 10
Take example of length and width (Length = l and width = w), then:
=> P = 2l +  2w
=> 50 = 2l + 2(l - 10)
=> 50 = 4l - 20
=> 4l = 70, then l = 15.
If l = 15, then w = 5. 
=> Area = l x w = 15 * 5 = 75cm².
So the length is 15 cm, with its width 5 cm and its area 75 cm²