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3 years ago

-2x+1=7 how do I do this?

Mathematics

2 answers:

Agata [3.3K]3 years ago

7 0

Answer:

-3

Step-by-step explanation:

Write the equation down, the first step is to minus the one from both sides of the equal sign(since it’s the opposite then adding) so you cancel out the 1 and do 7-1 your equation would look like this : -2x=6 the next step is to divide the -2 (it’s the opposite of multiplication) your answer would be x=-3

ivanzaharov [21]3 years ago

5 0

Answer: x=-3

Step-by-step explanation: -2x+1=7

-2x=7-1

-2x=6

-2x/-2=6/-2

X=-3

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X+4+3x=72 x+4+3x=72 .

Aneli [31]

Answer:

yes it does equal 72

Step-by-step explanation:

4 0

2 years ago

How does the order of operations relate to solving multi-step equations? Use examples of solving an equation, and then evaluatin

givi [52]

The order of operations helps keep answers for multi-step equations similar. If the proper order of operations are not followed, then answers may vary. To show an example:

4 / 2 - 1

The proper order of operations would be:

Divide first, before subtracting
4 / 2 - 1
2 - 1
1

But if subtracting was done before dividing:

4 / 2 - 1
4 / 1
4

So not following the proper order would yield different and erroneous answers.

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3 years ago

Find the selling price of a $7.50 agenda book with a 15% discount.

Diano4ka-milaya [45]

Answer:

The selling price of the agenda book is $6.38 to the nearest cent.

Step-by-step explanation:

Assume that the cost price of the agenda book is 100%

∵ The discount is 15%

∵ The selling price = the cost price - discount amount

∴ The selling price = 100% - 15%

→ That means the selling price is 85% of the cost price

∵ The cost price = $7.50

∴ The selling price = 85% × 7.50

→ Change 85% to a number by divide it by 100

∴ The selling price = $\frac{85}{100}$ × 7.50

∴ The selling price = 6.375

→ Round it to the nearest cent (2 d.p)

∴ The selling price = $6.38

∴ The selling price of the agenda book is $6.38 to the nearest cent.

8 0

3 years ago

A buoy floating in the sea is bobbing in simple harmonic motion with period 2 seconds and amplitude 8 in. Its displacement d fro

Mrac [35]

Answer:

The equation of the displacement $d$ as a function of time $t$ is :

$d(t)=8sin(\pi t+\pi )$

Step-by-step explanation:

Generally , A simple harmonic wave is a sinusoidal function that is it can be expressed in simple $sin$ or $cos$ terms.

Thus,

$d(t) = Asin(wt+c)$

is the general form of displacement of a SHM.

where,

$d(t)$ is the displacement with respect to the mean position at any time $t$
$A$ is amplitude
$w$ is the natural frequency of oscillation ( $rads^{-1}$ )
$c$ is the phase angle which indicates the initial position of the object in SHM ( $rad$ )