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3 years ago

HELP MEEEEEEEEEE!!!!!!!

Mathematics

2 answers:

sweet-ann [11.9K]3 years ago

7 0

Know that in a ordered pair for example (0, 2) the first number (0) is the x cord and the second (2) is the y cord

Simply plug the cords they give you in for x and y for each question and solve

1. y = 2x, test with the cords they gave you. So it becomes 2 = 2(0) 2 * 0 equals zero and 2 does not equal 0 so the answer is no.

(I cant see the second one)

3. y = 2x + 3 (3, 9)

Plug them in

9 = 2(3) + 3

9 = + 6 + 3

9 = 9

So the answer here is yes

morpeh [17]3 years ago

5 0

Answer:

yes

Step-by-step explanation:

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The football coach bought enough sports mix to make 60 L of a sports drink.

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3 years ago

A train travels at an average speed of 18 m/s.

GrogVix [38]

Answer:

28 seconds

Step-by-step explanation:

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4 years ago

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Step-by-step explanation:

(x + 2)2 + 7

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3 years ago

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4 years ago

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15. Before oil is added to a certain road surface material, the other ingredients are mixed. The mixture contains

mojhsa [17]

Answer:

sand = 3450 pounds

3/4 inch stones =6750 pounds

1 inch stones =4800 pounds.

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:

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

The 3/4 inch stones weigh 6750 pounds

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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4 years ago