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3 years ago

Which accurately shows how to use inverse operations to find the value of a in a + 5 = 14?

Mathematics

2 answers:

KonstantinChe [14]3 years ago

7 0

The answer is a=9 because 14 minus 5 equals 9.

zubka84 [21]3 years ago

5 0

For this case we have the following expression:

$a + 5 = 14$

We must find the value of "a":

Subtracting 5 from both sides of the equation we have:

$a + 5-5 = 14-5$

Different signs are subtracted and the sign of the major is placed:

$a = 9$

Thus, the correct option is D.

ANswer:

$14-5 = a\\9 = a$

Option D

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John was swimming for hour and a half hours at a speed of 2 miles per hour. How far did he swim?

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Answer: 1 mile.

Explanation: 1/2 of an hour is 1 mile because the speed was 2 miles an hour so if you do half of that it is 1 mile.

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3 years ago

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PLEASE HELP The points (6, 8) and (x, 12) are two points on a graph of an inverse variation. Find the missing value. Show all wo

UNO [17]

Answer:

X=9

Step-by-step explanation:

6/8=3/4

x/12=3/4

x=9

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3 years ago

It takes a new mail carrier 4 hours to deliver the mail on route a. It takes an experienced mail carrier 3 hours to do the same

Pani-rosa [81]

Answer: $\frac{12}{7}\ \text{hours}$

Step-by-step explanation:

Given

New mail carrier takes 4 hours for delivery i.e.

New mail carrier completes $\frac{1}{4}$ part of work in 1 hour

Old mail carrier takes 3 hours for delivery i.e.

mail carrier completes $\frac{1}{3}$ part of work in 1 hour

If they work together, they complete the work in x hours i.e.

$\Rightarrow \dfrac{1}{x}=\dfrac{1}{4}+\dfrac{1}{3}\\\Rightarrow \dfrac{1}{x}=\dfrac{3+4}{12}\\\Rightarrow x=\dfrac{12}{7}\ \text{hours}$

4 0

3 years ago

Re write the statement 19+7 divided by 2-5 by including one pair of brackets to make the total equal to 8

Oksanka [162]

Answer:

The solution is given below:

Step-by-step explanation:

The computation is shown below:

= 19 + 7 divided by 2 - 5

= (19 + 7) ÷ (2) - 5

= 26 ÷ 2 - 5

= 13 - 5

= 8

Hence, after solving this the value would be 8

Therefore it is equal to the 8

Hence, the given statement is true

6 0

2 years ago

Solve the following system by any method -8x-8y=0 -8x+2y=-20

iVinArrow [24]

$\fbox{Solution by using Matrix}$

$\text{Linear Equation} = -8x-8y=0 , -8x+2y=-20$

$\text{Rewrite the linear equations above as a matrix}$

$\left[\begin{array}{ccc}8&-8&0\\-8&2&-20\\\end{array}\right]$

$\text{Apply to Row2 : Row2 + Row1}$

$\left[\begin{array}{ccc}8&-8&0\\-8&-6&-20\\\end{array}\right]$

$\text{ Simplify rows}$

$\left[\begin{array}{ccc}8&-8&0\\0&1&10/3\\\end{array}\right]$

$\text{Note: The matrix is now in echelon form.}$ $\text{The steps below are for back substitution.}$

$\text{Apply to Row1 : Row1 + 8 Row2}$

$\left[\begin{array}{ccc}8&0&80/30\\0&1&10/3\\\end{array}\right]$

$\text{ Simplify rows}$

$\left[\begin{array}{ccc}1&0&10/3\\0&1&10/3\\\end{array}\right]$

$\text{Therefore, the solution is}$

$x= \dfrac{10}{3} \ \text{and} \ \ y=\dfrac{10}{3}$

7 0

3 years ago