While fire clay bricks have a density of 2400 kg/m3, for common red bricks it is 1900 kg/m3 . [
Answer:
p = 
Step-by-step explanation:
Given that p varies inversely with q then the equation relating them is
p =
← k is the constant of variation
To find k use the condition p = 2 when q = 1, thus
k = pq = 2 × 1 = 2
p =
← equation of variation
Answer:
30
Step-by-step explanation:
12 is 40% of the total number of cards.
12 = 0.4x, where x is total number of cards
/0.4 /0.4
30 = x
30 cards
1981+25
Since she was born in the year 1981, and her son was born 25 years later so you add 25