Answer:
choice 1) 2x + 40 = 180
Step-by-step explanation:
(x + 10) + (x + 30) = 180
2x+ 40 = 180
The idea behind this is grouping 10s together in the product.
Please check the attached table for entire sheet.
21
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Answer:
see explanation
Step-by-step explanation:
The first figure is a parallelogram with area (A) calculate as
A = bh ( b is the base and h the perpendicular height )
Here A = 144, b = 16 and h = x, thus
144 = 16x ( divide both sides by 16 )
x = 9
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The second figure is a trapezium with area (A ) calculated as
A = h (a + b)
where h is the height and a, b the parallel bases
Here A = 480, h = x, a = 37 and b = 27, thus
480 = x (37 + 27) = x × 64 = 32x ( divide both sides by 32 )
x = 15