5. Explain how you could use compatible numbers to estimate 245 ÷ 3. Then estimate the quotient.
1 answer:
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2x + y = -6
y = ⁻¹/₃x - 1
2x + (⁻¹/₃x - 1) = -6
2x - ¹/₃x - 1 = -6
1²/₃x - 1 = -6
+ 1 + 1
1²/₃x = -5
1²/₃ 1²/₃
x = -3
y = ⁻¹/₃x - 1
y = ⁻¹/₃(-3) - 1
y = 1 - 1
y = 0
(x, y)= (-3, 0)
y = ⁻¹/₃x - 1
2x + (⁻¹/₃x - 1) = -6
2x - ¹/₃x - 1 = -6
1²/₃x - 1 = -6
+ 1 + 1
1²/₃x = -5
1²/₃ 1²/₃
x = -3
y = ⁻¹/₃x - 1
y = ⁻¹/₃(-3) - 1
y = 1 - 1
y = 0
(x, y)= (-3, 0)
Answer:
1) 147
2) 87
Step-by-step explanation:
1) Area of triangle = × base length × height
= × 14 × 10
= 70
Area of a semicircle = ( r is the radius)
Radius = half of diameter = = 7m
Area of semicircle =
= 77 ( Nearest whole number )
Total area = 77 + 70 = 147
2) Divide the shape into 2 rectangles
Area of a rectangle = length × width
Rectangle 1 = 7 × ( 3+3+5 )
= 7 × 11 = 77
Rectangle 2 = 2 × 5
= 10
Total Area = 77 + 10 = 87