bryantnaomi6
03.07.2019 •
Mathematics
Julie buys 2kg of apples and 7kg of pears for £12.70. the pears cost £1.30 per kilogram what is the price per kilo of the apples (show working )
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Ответ:
a for apples
p for pears.
since we know a kilogram of pears cost 1.30
2a+7p= 12.70
we can put in the value of pears
2a+7(1.30)= 12.70
2a+ 9.1 = 12.70
2a = 12.70 - 9.1
2a= 3.6
a= 3.6/ 2
a= 1.8 a kilogram of apples cost 1.8£
Ответ:
part a:
9x2 + 24x + 16 =
(3x + 4)^2
each side measures (3x + 4) units.
part b:
16x^2 - 25y^2 =
= (4x + 5y)(4x - 5y)
the dimensions of the rectangle are (4x + 5y) units and (4x - 5y) units.