3x+y= 7 2x+y= 6 what is x and what is y

Ms.Brown flight left at 9:20 a.m Her plane landed 1 hour ane 23 min later. What time did her plane land?

Aliun [14]

You have to count add 83 minuets to 9:20

3 0

3 years ago

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A box has three cards numbered 1, 2, and 3

Igoryamba

Answer:

{1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B, 3C}

{1C, 2C, 3C}

Step-by-step explanation:

First is all possibilities. Let's do it one step at a time. The first step is the number, what are all the numbers that can be chosen? 1 2 and 3. then, when you pick1, what are all the letters that can be chosen? A B and C. Do this for 2 and 3 and you get all possibilities.

{1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B, 3C}

When you have steps like this you can multiply the number of results to get the total number of possibilities as well. Step one has 3 results, step 2 has 3 results, that means there are 3*3 total, which is 9. Do be careful it matches this kind of setup, where the step 2 is the same for all step 1s. So if instead if you got 1 for step 1 you picked from a bag with 3 things, then for 2 you picked from a different bag with a different number, that multiplication trick wouldn't work.

Now just pick throught he sample space to find all with C. There are three, {1C, 2C, 3C}

7 0

3 years ago

An artist wants to frame a square painting with an area of 400 square inches she wants to know the lenth of the wood trim that i

Jet001 [13]

Answer:

The formula for the area of a square with sides of length x is A = x2 so

x2 = 400 is the equation

This equation has 2 solutions, namely x = ±√400 = +20 or -20

The negative solution does not make sense because a length cannot be less than 0.

The total length needed to go around the painting is the perimeter of the square, which is

P = 4*x = 4*20 = 80 inches

7 0

3 years ago

Lindsay is creating a bridge out of dried pasta and glue. In her plans, she sketches the graph to determine the lengths of the n

alexgriva [62]

From the graph shown it can be seen that the bridge is represented by a parabola with vertex of (5, 8) and roots of 1 and 9.

Recall that the vertex form of the equation of a parabola with vertex (h, k) is given by
$y=a(x-h)^2+k$

Thus, the equation of the given graph in vertex form is given by
$y=a(x-5)^2+8$

Also, recall that the equation of a parabola with roots, p and q, is given by
$y=a(x-p)(x-q)$

Thus the equation of the given graph can be given by
$y=a(x-1)(x-9)$

To get the value of a, we equate both equations and solve as follows:
$a(x-5)^2+8=a(x-1)(x-9) \\ \\ a(x^2-10x+25)+8=a(x^2-10x+9) \\ \\ ax^2-10ax+25a+8=ax^2-10ax+9a \\ \\ 25a-9a=-8 \\ \\ 16a=-8 \\ \\ a=- \frac{8}{16} =- \frac{1}{2}$

Therefore, the <span>function that Lindsay used to create her design is
$f(x)=-0.5(x-5)^2+8$
</span>

4 0

3 years ago

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A store is having a sale on all items. Everything is 30% off the original price,p. Write an expression that can express the pric

Basile [38]

Answer:

X= .70×Y

Step-by-step explanation:

Y would be the value of the item and x is the outcome of the discount.

7 0

3 years ago