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3 years ago

What is the solution to this system of equations x-3y=-2 x+3y=16

1 answer:

6 0

X- 3y = -2
x + 3y = 16
----------------add
2x = 14
x = 14/2
x = 7

x + 3y = 16
7 + 3y = 16
3y = 16 - 7
3y = 9
y = 9/3
y = 3

solution is : (7,3)

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What is 2 and 6/7 times 4/5

bulgar [2K]

Answer:

Step-by-step explanation:

2 6/7 * 4/5....turn ur mixed number into an improper fraction and just multiply

20 / 7 * 4 / 5 = 80/35 which reduces to 16/7 or 2 2/7

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2 years ago

A long distance runner does a first lap around a track in exactly 50 seconds.As she tires.Each subsequent lap takes 20% longer t

madreJ [45]

Answer:

182 seconds

Step-by-step explanation:

Given:

Time taken for first lap is 50 seconds and each subsequent lap takes 20% longer than previous

Solution:

Time taken for first lap = 50 sec

For second lap

Each subsequent lap takes 20% longer than previous

Previous lap time = 50 sec

second lap = 50 + 20% of 50

second lap $=50+(\frac{20}{100}\times 50)$

second lap $= 50 + 10$

second lap $= 60\ sec$

For third lap

Each subsequent lap takes 20% longer than previous

Previous lap time = 60 sec

Third lap = 60 + 20% of 60

$Third\ lap = 60 + (\frac{20}{100}\times 60)$

$Third\ lap = 60+2\times 6$

$Third\ lap = 60+12$

$Third\ lap = 72\ sec$

Time taken for 3 laps is equal to sum of all three laps time.

$Tiem\ taken\ for\ 3\ lap = 50+60+72$

$Tiem\ taken\ for\ 3\ lap = 182\ sec$

Therefore, it takes 182 seconds (3 min, 2 seconds) to run three laps

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3 years ago

I need help please help me

SpyIntel [72]

Answer:

The Answer is 25

Step-by-step explanation:

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3 years ago

Read 2 more answers

What is the factorization of 2x^2+9x+9

iogann1982 [59]

Answer:

(2x+3)*(x+3)

Step-by-step explanation:

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2 years ago

Explain how finding 7×20 is similar to finding 7×2000 then find each product

AURORKA [14]

You will get the same answers but with more zeros. For example 7x20 is 140, and 7x2000 is 14,000 but with more zero's

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3 years ago