2800 ÷ 400
Cross out 2 zeros from both numbers, then you have 28 ÷ 4 = 7
Answer:
6
Step-by-step explanation:
The circumference of a circle is 
, so
. We can use this because the area of a circle is
. Thus,
.
Answer:
b.7.69
Step-by-step explanation:
188/4=29.5
29.5 gal per mile
227/29.5=7.69
Answer:
8 pounds of 4% solution of borax
Step-by-step explanation:
Let x be the 4% solution
24 pounds of 12% solution
obtain a 10% solution of borax that is (x+24) pounds
4% is 0.04 and 12% is 0.12 , 10% is 0.1

solve the equation for x

so 8 pounds of 4% solution of borax