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Furkat [3]
3 years ago
5

Three times the sum of the numbers x and 5 is 21.

Mathematics
1 answer:
MrRissso [65]3 years ago
7 0
3 (x+5)=21 is the answer
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Solve the radical equation x – 7 = square root of -4x+28. Which statement is true about the solutions to the radical equation? T
Julli [10]

Answer:

x = 3 and 7

There are two true solutions.

Step-by-step explanation:

To solve x-7 = \sqrt{-4x+28}, use inverse operations by squaring both sides of the equal sign.

(x-7)^2 = (\sqrt{-4x+28})^2\\x^2-14x+49 = -4x+28\\x^2-14x+4x+49-28 = 0\\x^2-10x+21=0

The quadratic expression can be factored into binomials and set equal to 0 by the zero product property to find x.

(x - 3) ( x - 7) = 0

x-3 = 0 so x=3

x-7 = 0 so x=7

Now check each solution into the original equation to be sure it solve the solution and is not extraneous.

7-7 = \sqrt{-4(7)+28}\\ 0=0

and

3-7 = \sqrt{-4(3)+28}\\[tex]-4 = \sqrt{16}\\-4 =-4[/tex]

3 0
3 years ago
The vertex of this parabola is at 2, -1 When the y-value is 0 the x value is 5 what is the coefficient of the squared term in th
Olegator [25]

Answer:

\large \boxed{\sf \frac{1}{9}}

Step-by-step explanation:

\sf y=a(x-h)^2+k

\sf Vertex = (h,k)

y-value is 0 and the x value is 5

h = 2

k = -1

\sf 0=a(5-2)^2+-1

Solve for \sf a (the coefficient of the squared term).

\sf 0=a(3)^2+-1

\sf 0=9a-1

\sf 9a=1

\displaystyle \sf a=\frac{1}{9}

The coefficient of the squared term in the parabola equation is 1/9.

8 0
3 years ago
Read 2 more answers
Answer correct please
natita [175]

Answer:

correct

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
jayson buys a car and pays by installments, each installments is $567 per month. after 48 months, jayson owes $1250. what was th
KIM [24]
Okay so like, all you've gotta do is multiply 567 by 48 & add 1250. Leaving you with the answer of 28,466
7 0
3 years ago
What are the nouns in this sentence?
fgiga [73]

Answer:

A noun is most commonly taught a person, place, or thing and sometimes idea. In this sentence, it would be Magazine, Americans, and carbohydrates. And if smith is also part of the sentence, he is a person, so its also a noun. :) Happy learning friend

3 0
2 years ago
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