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3 years ago

3x+2y=-19 -3x-5y=25 solve for x and y

2 answers:

5 0

X= -5
y= -2
I didn't double check the answers by inputting them back into the equations, but if you want to then you can. Yet I am 99% positive my answer is correct.

aksik [14]3 years ago

3 0

Add both equations;
3x+2y=-19
-3x-5y=25
o-3y=6
so, y=6÷(-3)=-2
and for x 3x+2(-2) =-19⇒ 3x-4=-19⇒3x=-15⇒x=-5
hope so it will help

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If the seed company recommends planting approximately 350 grass seeds per square meter, about how many grass seeds will he need?

Svetach [21]

Answer:

83422.5 grass seeds

Step-by-step explanation:

Applying,

A = 1/2bh....................... Equation 1

Where A = Area of the Triangle, b = base, h = height.

But, from the diagram,

tanФ = 20/b

b = 20/tanФ.................. Equation 2

Substitute equation 2 into equation 1

A = 1/2(20/tanФ)(h)................ Equation 3

Given: h = 20 m, Ф = 40°

Substitute these values into equation 3

A = 1/2(20×20)/tan40°

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If the seed company recommends planting approximately 350 grass seeds per square meter,

Therefore,

Number of grass seed need = (350×238.35)

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3 years ago

You are dealt one card from a standard 52-card deck. Find the probability of being dealt a six.

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Answer:

1/13 ≈ 7.69%

Step-by-step explanation:

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3 years ago

Tickets to the zoo cost $12 for adults and $8 for children. The school has a budget of $240 for the field trip. An equation repr

Oxana [17]

Answer:

18 children

Step-by-step explanation:

Given

$240 = 12x +8y$

Required (missing part of the question):

Number of children that will be able to go to the zoo if 8 adult tickets are purchased

The graph is missing. However, the question can be solved without the graph.

From the question and equation, we can deduce the following:

x represents adults
y represents children

So, when 8 adult tickets were sold.

This means

$x = 8$

Substitute 8 for x in $240 = 12x +8y$

$240= 12 * 8 + 8y$

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Subtract 96 from both sides

$240 - 96 = 96 - 96 + 8y$

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$8y = 144$

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$y= \frac{144}{8}$

$y= 18$

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3 years ago

A ball is launched straight up in the air from a height of 6 feet. Its velocity (feet/second) t seconds after launch is given by

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Step-by-step explanation:

A ball is launched straight up in the air from a height of 6 feet. The velocity as a function of time t is given by :

f(t) = -32 t+285

Height of the ball is :

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$h(t)=-16t^2+285t+6$

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2 years ago