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NISA [10]
2 years ago
12

SOMEONE HELP ME WITH THIS

Mathematics
1 answer:
Alexandra [31]2 years ago
8 0

Answer:

X=7 and y=6

Step-by-step explanation:

Y=-2x + 20.......eq(i)

6x-5y=12.....eq(ii)

Now, putting y= - 2x +20 in eq (ii)

6x - 5(-2x + 20)=12

6x + 10x - 100 = 12

16x=12+100

X=112 /16

X=7

Then, putting x=7 in eq (i)

Y=-2*7 +20

=-14 +20

=6

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3 years ago
5. A ball is thrown upward with an initial velocity of 50 feet per second. The
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Answer:

SEE BELOW IN BOLD.

Step-by-step explanation:

a.

h = -16t^2 + 50t

h = 20 t

When the height is the same:

-16t^2 + 50t = 20t

-16t^2  + 30t = 0

t(-16t + 30) = 0

t = 0 or  -16t + 30 = 0, so:

t = 0 or -30/-16 = 1.875

So the answer is 1.88 seconds to the nearest hundredth.

b.

For the ball

h = -16t^2 + 50t

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dh/dt = -32t + 50 = 0

t = -50/-32 = 1.563

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c.

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7 0
2 years ago
George used the diagram below to help determine 30% of 60. Which expression could George have used?
VARVARA [1.3K]

Answer:

(3)(6)

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ivanzaharov [21]

Answer:

b. Kathy

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Since Kathy is 3 standard deviation better than her class' average, while John is only 2's. We conclude that Kathy did better.

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