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3 years ago

Which statement is true about 4 + 2x is true

Mathematics

1 answer:

ElenaW [278]3 years ago

7 0

Answer:

Step-by-step explanation:

In the expression

4 + 2x

there are two adding terms: 4 and 2x

the first term is a constant and the second term has only one variable (x)

the coefficient of x is 2

The analysis gives un only one correct choice:

1. 4+2x is a sum

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Jenna spends $15.04 at the store on notebooks and folders for school. Notebooks cost $4.85 each, and folders cost $0.89 each. Sh

cluponka [151]

Answer:

$\boxed{\text{2 notebooks and 6 folders}}$

Step-by-step explanation:

Let n = number of notebooks

and f = number of fodders

You have a system of two equations:

$\begin{cases}(1)& 4.85n + 0.89f = 15.04\\(2) & n+ f = 8\end{cases}\\\\$

$\begin{array}{lrcll}(3) & f & = & 8-n &\text{Subtracted n from each side of (2)}\\& 4.85n+0.89(8-n) & = & 15.04 &\text{Substituted (3) into (1)}\\& 4.85n+7.12-0.89n & = & 15.04 &\text{Distributed 0.89}\\& 3.96n+7.12 & = & 15.04 &\text{Combined like terms} \\& 3.96n & = & 7.92 & \text{Subtracted 7.12 from each side} \\(4) & n & = & 2 & \text{Divided each side by 3.96}\\& 2+ f & = & 8 & \text{Substituted (4) into (2)}\\& f & = & 6 &\text{Subtracted 2 from each side} \\\end{array}$

Jenna bought $\boxed{\textbf{two notebooks and six folders} }$ .

Check:

$\begin{array}{rclcrcl}4.85\times2+0.89\times6 & =& 15.04 & \qquad &2+6&=&8\\9.70+5.34 & = & 15.04 & \qquad &8&=&8\\15.04& = & 15.04 & & & & \\\end{array}$

OK.

4 0

3 years ago

Solve:<br> y = 2x -11<br> -3y = -6x -15

Nikolay [14]

9514 1404 393

Answer:

no solution (parallel lines)

Step-by-step explanation:

You observe that the coefficient in the second equation are all multiples of 3. Dividing that equation by -3 gives the two equations ...

y = 2x - 11
y = 2x + 5

The slopes are the same (2) and the intercepts are different (-11, 5), so the lines are parallel. There is no solution.

7 0

3 years ago

Help me with this plz

wel

Answer: 42

Step-by-step explanation:

7 0

3 years ago

Which of the following is equal to the rational expression when x 3 or -10?

abruzzese [7]

Answer:

A. (x+5) / (x+10)

Step-by-step explanation:

______

5 0

3 years ago

Two numbers have a difference of 4 and -8. What is their product?

Wittaler [7]

Difference means - so 4-(-8)

which also the same as 4+8 so ur answer is 12

7 0

3 years ago