8 litres (amount of 20% solution needed) and 7 litres for (amount of 50% solution needed)
<u>Step-by-step explanation:</u>
Let consider ‘x’ for 20% acid solution and (15 – x) for 50% acid solution. And so, the equation would be as below,
20% in x + 50% in (15 – x) = 15 litres of 34%
Convert percentage values, we get
0.20(x) + 0.50 (15 – x) = 15 (0.34)
0.20 x + 7.5 – 0.50 x = 5.1
-0.3 x + 7.5 = 5.1
0.3 x = 7.5 – 5.1
0.3 x = 2.4
Apply ‘x = 8’ value in (15 – x) we get,
15 – 8 = 7 litres
The value of 7 litres for (amount of 50% solution needed)
First find the volume of brick = 18 * 9 * 6 = 972 cm^3
volume of wall
Take note of units in meters. 1m = 100 cm
so we have 4.5 * 100 * 18 * 3.6 * 100 = 2,916,000 cm^3
So we divide the volume of wall by volume of brick to know how many bricks required
2,916,000/972 = 3,000 bricks
Answer:
40 ft, max height
Step-by-step explanation:
Nick tossed a penny off a 20 foot bridge.
The path of the penny's height can be modeled by the equation h(t) = -16t^2 + 40t + 20.
Find the maximum height of the penny.
:
Find the axis of symmetry, x = -b/(2a); a=-16, b=40
Answer:
The amount saved in June is;
$(2x + 4)
Step-by-step explanation:
Here, we want to get the amount saved in June
From the question, she saved $5 more than twice here usual amount
twice here usual amount is 2 * x = $2x
So, adding the extra $4; the amount saved will be;
2x + 4