Answer:
Step-by-step explanation:
You do what's in the innermost brackets first, unless you have an unknown variable.
Answer:
Step-by-step explanation:
slope = (5-77)/(98-2) = -72/96 = -¾
Answer:
Numerical expression
Step-by-step explanation:
This is a numerical expression since there is no unknown value. Both values being multiplied are numbers.
Answer:
12
Step-by-step explanation:
Mean is the average of all the numbers. Add up all the numbers then divide by how many you have.
Answer:
600 L of 30% proof and 400 L of 80% proof is needed
Step-by-step explanation:
Let the amount of 30% smell proof be x while that of 80% smell proof is y
Then;
x + y = 1000 •••••(i)
Also;
30% of x + 80% of y = 50% of 1000
0.3x + 0.8y = 500 •••••(ii)
From i, x = 1000 - y
Put this into ii
0.3(1000-y) + 0.8y = 500
300 - 0.3y + 0.8y = 500
0.5y = 500-300
0.5y = 200
y = 200/0.5
y = 400 L
But x = 1000 - y
x = 1000 - 400 = 600 L
