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3 years ago

If b = 7, what is the value of the expression 2(10 – b)? A. 4 B. 6 C. 24 D. 34

Mathematics

2 answers:

MAVERICK [17]3 years ago

7 0

the answer is b 6 because 10-7 is 3 and 3 times 2 is 6

Bond [772]3 years ago

4 0

Hi,

$b = 7 \\ 2(10 - b) = 2(10 - 7) \\ 2(3) = 2 \times 3 = 6$

The answer is B.

Hope this helps.
r3t40

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Please help!

mrs_skeptik [129]

Answer:

2/3

Step-by-step explanation:

We can use the slope formula

m = (y2-y1)/(x2-x1)

= (12-8)/(4 - -2)

(12-8)/(4+2)

4/6

2/3

7 0

3 years ago

4xsquared - 9=0? could anyone help me solve this quadratic equation by FACTORING?

Verizon [17]

$\bf \textit{difference of squares}
\\ \quad \\
(a-b)(a+b) = a^2-b^2\qquad \qquad 
a^2-b^2 = (a-b)(a+b)\\\\
-------------------------------\\\\
4x^2-9=0\implies 2^2x^2-3^2=0\implies (2x)^2-3^2=0
\\\\\\\
[(2x)-3][(2x)+3]=0\implies 
\begin{cases}
2x-3=0\\
2x=3\\
x=\frac{3}{2}\\
------\\
2x+3=0\\
2x=-3\\
x=-\frac{3}{2}
\end{cases}$

7 0

3 years ago

Answers for the 2 boxes please:)

masha68 [24]

Answer:

(5,-5)

Step-by-step explanation:

Eliminate y-term

$(2x + 5x) + ( - 3y + 3y) = 25 + 10 \\ 7x = 35 \\ x = \frac{35}{7} \\ x = 5$

We can eliminate x-term but for this system of equations, eliminating y-term is faster.

Substitute x = 5 in any given equations.

I will choose to substitute in the first equation.

$2x - 3y = 25 \\ 2(5) - 3y = 25 \\ 10 - 3y = 25 \\ 10 - 25 = 3y \\ - 1 5 = 3y \\ 3y = - 15 \\ y = - 5$

Answer Check

Substitute both x-value and y-value in any given equations

$2x - 3y = 25 \\ 2(5) - 3( - 5) = 25 \\ 10 + 15 = 25 \\ 25 = 25$

The equation is true. (It is better to check both the answer for both equation.)

Thus the answer is (5,-5)

6 0

3 years ago

The sum of two numbers is 45 . the smaller number is 9 less than the larger number. what are the numbers?

Cerrena [4.2K]

Larger Number: L
Smaller Number: L-9
Larger Number + Smaller Number = 45

L + L - 9 = 45
2L = 54
L = 54/2
L = 27

Smaller Number = L - 9
27 - 9 = 18

Check. .. 27 + 18 = 45. CORRECT!

Larger Number is 27
Smaller Number is 18

7 0

3 years ago

Makenzie graphs the line y= 2x + 13. Which statement is true?

slamgirl [31]

Answer:

The point (-4,5) is on the line

Step-by-step explanation:

You can replace the x and y values to determine if it is a true statement

First Statement

5= 2(-4)+13 -> 5= -8+13 -> 5=5 true

Second Statement

-4=2(5)+13 -> -4= 10+13 -> -4 ≠ 23 false

You can automatically eliminate the next two answers because you already found that the first statement is true and because you can find points using an equation.

5 0

3 years ago