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3 years ago

6a_6b+3a+4b pleas help me and cool

Mathematics

1 answer:

Ahat [919]3 years ago

8 0

Answer:

9a - 2b

Step-by-step explanation:

6a - 6b +3a +4b . . . . . . . we assume your _ is supposed to be -

= a(6 +3) +b(-6 +4)

= 9a -2b

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2 4/5 ÷ 2 1/5 =<br> (Please answer as a fraction)

svet-max [94.6K]

Answer:

1 3/11

Step-by-step explanation:

8 0

3 years ago

The radius of a circle is decreasing at a rate of 6.56.56, point, 5 meters per minute. At a certain instant, the radius is 12121

Ilia_Sergeevich [38]

Answer:

The rate of change of the area of the circle is approximately $-490.09 \ m^2/min$ .

Step-by-step explanation:

Given:

$\frac{dr}{dt} = -6.5 \ m/min$

radius $r =12 \ m$

We need to find the rate of change of the area of the circle at that instant.

Solution:

Now we know that;

Area of the circle is given by π times square of the radius.

framing in equation form we get;

$A= \pi r^2$

to find the rate of change of the area of the circle at that instant we need to take the derivative on both side.

$\frac{dA}{dt}=\frac{d(\pi r^2)}{dt}\\\\\frac{dA}{dt}= 2\pi r \frac{dr}{dt}$

Substituting the given values we get;

$\frac{dA}{dt}= 2\times \pi \times 12 \times -6.5\\\\\frac{dA}{dt}\approx -490.09 \ m^2/min$

Hence The rate of change of the area of the circle is approximately $-490.09 \ m^2/min$ .

6 0

2 years ago

Alicia took a survey to determine her classmates’ favorite pets. She wrote the results on the board. Select whether each stateme

insens350 [35]

Answer:

Step-by-step explanation:

7 0

2 years ago

Need this ASAP! Taking a math quiz and my brain just went numb so I cant think

NikAS [45]

Answer:

$\frac{ - 12 + x}{11} = - 3 \\ \\ - 12 + x = - 3\times 11 \\ \\ - 12 + x = - 33 \\ \\ x = - 33 + 12 \\ \\ x = - 21$

3 0

1 year ago

Sam wants to improve his GPA. to earn a 4.0 this semester. His prior GPA was a 2.75. Imagine that there is an equation that says

Snowcat [4.5K]

Answer:

4.6 hours

Step-by-step explanation:

Let 'S' be the number of study hours, 'C' be the number of class attendance hours and 'G' be his prior GPA. His new GPA is given by:

$GPA = 0.5S+0.25C+0.25G$

For C = 4 hours and G = 2.75, the number of study hours required to reach a GPA of 4.0 is:

$4.0 = 0.5S+0.25*4+0.25*2.75\\S=\frac{4.0-1-0.6875}{0.5} \\S=4.6\ hours$

Sam needs to study 4.6 hours in order to get a 4.0 GPA.

5 0

3 years ago