Achemical company makes two brands of antifreeze. the first brand is 45% pure antifreeze and the second brand is 70% pure antifreeze. in order to obtain 150 gallons of a mixture that contains 55% pure antifreeze, how many gallons of each brand of antifreeze must be used?

60 gallons of 70% antifreeze

Step-by-step explanation:

Let n be the amount of 70% antifreeze. And the second brand was 45% pure anti freeze Then:

According to the question

0.7 n+.45(150-n)=0.55(150)

 0.7 n+67.5-0.45 n=82.5

0.25×n=15

n=15/.25 = 60

You need 60 gallons of 70% antifreeze, and 90 gallons of 45% antifreeze for this mixture

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.

congruent segments

step-by-step explanation: