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3 years ago

Evaluate the expression when x=2 and y= -3. -x+2y

Mathematics

2 answers:

Ede4ka [16]3 years ago

7 0

Answer:

it would be -2 + 2(-3)

Step-by-step explanation:

the numbers given would replace the variables, so x would become -2 since its -x, and y would be (-3) in parenthesis since its to be multiplied (i believe if im remembering correctly) therefore it would become:

-2 + 2(-3)

keeping all the signs and proper places

hope this helped and is what you were looking for!!

zimovet [89]3 years ago

3 0

Answer:

-8

Step-by-step explanation:

It would be -2+2(-3)

Which means -2 plus 2 times -3

According to PEMDAS you have to do parenthesis first so 2 times -3 is -6 +-2=-8

So the answer is -8

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Answer:

irrational numbers

Step-by-step explanation:

irrational numbers

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4 years ago

Two dice are rolled. Find P(sum 6| first die is a 4)

Burka [1]

Answer:

1/36

Step-by-step explanation:

p(4) is 1/6

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3 years ago

A pole that is 2.6 m tall casts a shadow that is 1.03 m long. At the same time, a nearby tower casts a shadow that is 46.25 m lo

photoshop1234 [79]

Answer:

Therefore the height of the tower is 116.75 m.

Step-by-step explanation:

Given that a pole that is 2.6 m tall casts a shadow that is 1.03 m long.

Here the height of a object directly proportional to the shadow. It means

Height of the object ∝ shadow

Height of the object= k.shadow

[k is the proportional constant.]

$\Rightarrow \frac{h}{s} =k$ [Height of object is denoted by h and shadow is denoted by s]

Then,

$\frac{h_1}{s_1} =k$ [h₁ is the height of the pole and s₁is the length of the shadow]

Again for the tower

$\frac{h_2}{s_2}=k$ [h₂ is the height of the tower and s₂ is the length of the shadow]

Therefore,

$\frac{h_1}{s_1}=\frac{h_2}{s_2} =k$

$\Rightarrow\frac{h_1}{s_1}=\frac{h_2}{s_2}$ ............(1)

Given $h_1 = 2.6 m$ , $s_1=1.03m$ and $s_2=46.25m$

Putting the value of $h_1,s_1$ and $s_2$ equation (1)

$\frac{2.6}{1.03}=\frac{h_2}{46.25}$

$\Rightarrow h_2 \times1.03= 2.6\times 46.25$ [cross multiplication]

$\Rightarrow h_2 = \frac{2.6\times 46.25}{1.03}$

$\Rightarrow h_2= 116.75$

Therefore the height of the tower is 116.75 m.

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3 years ago

How do I solve this problem correctly?

In-s [12.5K]

You have to find the parameter first!

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4 years ago

Identify the value of a if<br> y= ax+ 7x + 2<br> and the point (2, 12) is on the graph.

alexandr1967 [171]

Answer:

a=-2

So yep. ;)

Step-by-step explanation:

Alright, so, (2,12), 2 is the x and 12 is the y.

Stick them into the equation: $12=a*2+(7*2)+2$

Then, solve:

$12=a*2+14+2$

a = -2

So yes, they're on the graph.

Hope this helped! :)

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3 years ago

Evaluate the expression when x=2 and y= -3. -x+2y​

Evaluate the expression when x=2 and y= -3. -x+2y