A karat equals 1/24 part of gold in an alloy [ eg 9 karat gold is 9/24 gold]. How many grams of 9 karat gold must be mixed with18 karat gold to make 200 grams of 14 karat gold alloy?

Final answer:

The quadratic expressions in vertex form are (a) (x-1)²+10 and (c) (x-5)². These expressions follow the form a*(x-h)² + k, which is the standard form for a quadratic equation in vertex form.

Explanation:

The question asks to select all the quadratic expressions in vertex form. The vertex form of a quadratic equation is given by a*(x-h)² + k. Here, (h, k) is the vertex of the parabola. Let's examine the given options:

• (a) (x-1)²+10: The expression can be rewritten as 1*(x-1)² + 10, which is in vertex form.
• (b) (x-5)(x-4): This is not in vertex form, it is a factored form of quadratic equation.
• (c) (x-5)²: This is in vertex form with a = 1, h = 5 and k = 0.
• (d) x²-4x+4: This is standard form, not vertex form.
• (e) x(x-4): This is not in vertex form, it is a factored form of quadratic equation.

So, the quadratic expressions in vertex form are options (a) (x-1)²+10 and (c) (x-5)².

Learn more about Vertex Form here:

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Complete question:

Select all of the quadratic expressions in vertex form

a) (x-1)²+10

b) (x-5)(x-4)

c) (x-5)²

d) x²-4x+4

e) x(x-4)

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Final answer:

The quadratic expressions in vertex form in the given options are (x-1)^2+10 and (x-5)^2. The vertex form of a quadratic expression is a*(x-h)^2 + k, where a, h, and k are constants.

Explanation:

The quadratic expressions in vertex form among the given options are a) (x-1)^2+10 and c) (x-5)^2. In general, a quadratic expression is in vertex form if it is written as a*(x-h)^2 + k, where a, h, and k are constants, and h and k represent the vertex of the parabola.

In other words, the vertex form provides an efficient way to identify the vertex of a parabola, as represented by a quadratic equation, and provides the easiest way to graph such an equation. The other expressions b) (x-5)(x-4), d) x^2-4x+4, and e) x(x-4) are not in vertex form.

Learn more about Quadratic expressions here:

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An animal shelter has a ratio of dogs to cats that's 3:2. If there are 30 cats at the shelter, 45 dogs are there . 3/2 = x/30 , x= 30*3/2 =45

Answer:

The first one is B The second one is D and the last one is A

Answer:

8 • 7 – 4 = 9 • 5 -  7.

Step-by-step explanation:

Given  : 8 • 7 – 4 = ___________

To find : Which expression forms an equation with the given expression.

Solution : We have given  8 • 7 – 4 = ___________

First we solve the product

56 - 4.

52

Now we will check the 9 • 5 + 7

Solve the product  45 + 7 =  52.

So, the   8 • 7 – 4 = 9 • 5 -  7

Therefore,  8 • 7 – 4 = 9 • 5 -  7.