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Korvikt [17]
3 years ago
15

2.5 QUIZ ALGEBRA 2

Mathematics
1 answer:
LUCKY_DIMON [66]3 years ago
3 0

Answer:

Step-by-step explanation:

x²+24x+60=0

x²+24x+(24/2)²=-60+(24/2)²

(x+12)²=-60+144

(x+12)²=84

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Answer:

sand = 3450 pounds

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Step-by-step explanation:

The mixture composition is :

45% three-quarter inch stones

32% inch stones and

sand for balance

The percent here is by mass of material used.

Weight of mixture is 15,000 pounds before oil addition.

Use the percent by weight for the two types of stones and calculate real values in pounds

Formula to apply is:

Mass percent = (mass of a material/ total mass of mixture) * 100

For 3/4 inch stones it will be:

0.45= \frac{x}{15000} *100\\\\0.45=\frac{x}{150} \\0.45*150=x\\x=6750

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The 1 inch stones will be

32/100 * 15000 =4800

The 1 inch stones weigh = 4800 pounds

Total for the two items : 4800+6750 =11550 pounds

The sand used weighs : 15000 - 11550 = 3450 pounds

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