Answer:
Estimation
72+33
= 105
Exact sum
72.13+33.14
= 105.27
Can i please get brainliest answer?
Answer:
If b = 0 and c = -11, all you have to do is plug in the values into bc + b:
Step-by-step explanation:
(0)(-11) + 0 = 0
Answer:
57600cm^2
Step-by-step explanation:
To find the area, you do length * width. In this case, you do 360 * 160. The output will then be 57600cm^2
18 kg of 15% copper and 72 kg of 60% copper should be combined by the metalworker to create 90 kg of 51% copper alloy.
<u>Step-by-step explanation:</u>
Let x = kg of 15% copper alloy
Let y = kg of 60% copper alloy
Since we need to create 90 kg of alloy we know:
x + y = 90
51% of 90 kg = 45.9 kg of copper
So we're interested in creating 45.9 kg of copper
We need some amount of 15% copper and some amount of 60% copper to create 45.9 kg of copper:
0.15x + 0.60y = 45.9
but
x + y = 90
x= 90 - y
substituting that value in for x
0.15(90 - y) + 0.60y = 45.9
13.5 - 0.15y + 0.60y = 45.9
0.45y = 32.4
y = 72
Substituting this y value to solve for x gives:
x + y = 90
x= 90-72
x=18
Therefore, in order to create 90kg of 51% alloy, we'd need 18 kg of 15% copper and 72 kg of 60% copper.
