Vamos calcular quantos metros de corda Maria comprou na segunda vez:
33 - 21 = 12
Ela pagou R$ 9,60 a mais na segunda compra do que na primeira.
Logo, Maria pagou R$ 9,60 em 12 metros
Agora vamos calcular quanto ela pagou por metro:
9,60 ÷ 12 = 0,80
R$ 0,80 por metro
Para saber quanto Maria gastou na primeira compra multiplicamos os 21 metros pelo seu valor unitário:
21 × 0,8 = 16,80
Resposta: R$ 16,80 Letra B
Answer:
D -13/35 ( negative 13/35 )
Step-by-step explanation:
4/5 + x = 3/7
Convert to equivalent fractions with a common denominator:
28/35 + x = 15/35
Subtract 28/35 from both sides
x = - 13/35
The circle can be cut into pieces, separated, and fit together to form a parallelogram that has the same area. The height of the parallelogram is the radius and the base is half the circumference, which is r. The area is r(r), which is equal to r2.
8800 because the last two digits are above 50.
Answer:
87.92
In this case we're trying to find circumference
Formula: c = pi×d
The problem says to use 3.14 for pi
c = 3.14 × 28 = 87.92
