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3 years ago

Whether the expressions 2. 7y - 15 + 2y and 9y 15

Mathematics

2 answers:

ivanzaharov [21]3 years ago

8 0

Answer:

7y-15+2y= 9y-15

9y-15

.....

Step-by-step explanation:

AURORKA [14]3 years ago

7 0

Answer:

no solution

Step-by-step explanation:

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Suppose r(t)=costi+sintj+3tk represents the position of a particle on a helix, where z is the height of the particle above the g

Ilia_Sergeevich [38]

a. The $\vec k$ component tells you the particle's height:

$3t=16\implies t=\dfrac{16}3$

b. The particle's velocity is obtained by differentiating its position function:

$\vec v(t)=\dfrac{\mathrm d\vec r(t)}{\mathrm dt}=-\sin t\,\vec\imath+\cos t\,\vec\jmath+3\,\vec k$

so that its velocity at time $t=\frac{16}3$ is

$\vec v\left(\dfrac{16}3\right)=-\sin\dfrac{16}3\,\vec\imath+\cos\dfrac{16}3\,\vec\jmath+3\,\vec k$

c. The tangent to $\vec r(t)$ at $t=\frac{16}3$ is

$\vec T(t)=\vec r\left(\dfrac{16}3\right)+\vec v\left(\dfrac{16}3\right)t$

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3 years ago

In rectangle QRST, diagonals QS and RT are drawn and intersect at point P. Which of the following st

natta225 [31]

Answer:

Step-by-step explanation:

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3 years ago

Where did Jordan make her mistake? GIVING BRAINLIEST!

Ivenika [448]

Answer:

Jordan made mistake in his first step while multiplying.

Step-by-step explanation:

Given expression of Jordan's work is

14(8+4x) = 6x-(5-11x)

In the first step, Jordan multiplied the numbers to remove the braces.

He multiplied 14(8+4x) wrong as 14*8 is 112 rather than 126and on the right hand side, he did not change the sign of 11x to positive as two negatives are positive when multiplied.

Hence,

Jordan made mistake in his first step while multiplying.

7 0

3 years ago

What is 78,000,000 in scientific notation

fomenos

Answer:

7.8×10⁷

Step-by-step explanation:

You want to keep the coefficient (7.8) between 1 and 10 to achieve a normalized notation. Otherwise 78×10⁶ would also be an option.

3 0

3 years ago

Read 2 more answers

Quick algebra 1 question for 10 points!

valina [46]

<u>Answer:</u>

○ 1 hour 41 minutes or more

<u>Step-by-step explanation:</u>

We can make two equations that represent the total amount each plumber charges.

If $x$ represents the number of hours they work, then:

•Total charged by Plumber A = $35 + 15x$

• Total charged by Plumber B = $40+12x$

Now, if Plumber A is more expensive than Plumber B, then:

Total charged by Plumber A > Total charged by Plumber B

∴ $35 + 15x$ > $40+12x$

Now all we have to do is solve for $x$ :

$35 + 15x$ > $40+12x$

⇒ $35 + 15x -12x > 40$

⇒ $35 + 3x > 40$

⇒ $3x > 5$

⇒ $x > \bf \frac{5}{3} \space\ \mathrm{h}$

$\frac{5}{3} \space\ \mathrm h$ is equivalent to $\frac{5}{3} \times 60 \space\ \mathrm {min}$ = 100 minutes, which is the same as 1h 40min.

This means if Plumber A works more than 1h 40min, they become more expensive than Plumber B.

More than 1h 40min is equivalent to '1 hour 41 minutes or more', therefore the first option is correct.

4 0

1 year ago

Whether the expressions 2. 7y - 15 + 2y and 9y 15​

Whether the expressions 2. 7y - 15 + 2y and 9y 15