3 years ago

Solve by elimination 8x-6y=-20 -16x+7y=30

Mathematics

1 answer:

guajiro [1.7K]3 years ago

7 0

The answer is

X=-1

Y=2

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Dennis wants to buy a card for his wife. Dennis calculates the amount of the card as $4.50. The actual price of a card is $4. Wh

Alex17521 [72]

Answer:

12.5%

Step-by-step explanation:

$4.50-$4/$4 x 100%

0.5/4x100%

50/4= 25/2 = 12.5%

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3 years ago

Mandy Lee is making a sandbox for her children. She has made a wooden frame for her backyard that is 7 feet long, 6 feet wide, a

Westkost [7]

Answer:

Andrea is making a sandbox.She has made a wooden frame in her backyard that is 6 feet long, 6 feet wide, and 2 feet deep. She can purchase sand for $30 per cubic meter. How much will it cost for her to purchase sand? Hint: 1 foot equals 0.3048 meters.

Step-by-step explanation:

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3 years ago

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Correctly order the proceed for solving for x using the algebraic properties of equality.

Snezhnost [94]

Answer:

Step-by-step explanation:

Step 1: Subtract 9

50.24 = 3.14x²

Step 2: Divide by 3.14

x² = 16

Step 3: Square root both sides

x = ±4

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3 years ago

Please helpppp meee outttt

Elan Coil [88]

Answer:

Measure of <z would 125 degrees

Step-by-step explanation:

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2 years ago

In the 2014 - 2015 school year, the mean score on the critical reading of the SAT was 490 with a standard deviation of 102 for j

bonufazy [111]

<u>Answer:</u>

The Ranking Percentile is (B) 97.5%

<u>Explanation :</u>

To find the percentile rank we need to find the z- score. After finding the z-score match this value with the corresponding value in z-score table.

Formula to find the z-score

Z-score= $\frac{\text { scored obtained - mean }(\mu)}{\text { standard deviation }(\sigma)}$

Substituting the values in the above equation, we find

Z-score= $\frac{(694-490)}{102}$ =2

So, the Z-score is +2

Now, the corresponding value of Z-score 2 in the table is 0.9772

or the percentile score is 97.72 ~ 97.5 .

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3 years ago