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3 years ago

How do you solve 3.2x0.75

Mathematics

1 answer:

horrorfan [7]3 years ago

5 0

I don't know how to explain but the answer is 2.4.

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Cos²x - 2 sin²x = -2 .Help me to solve it

Alex777 [14]

Step-by-step explanation:

note that

sin²x = (1-cos²x)

LHS= cos²x - 2 sin²x

= cos²x - 2(1-cos²x)

= cos²x - 2 + 2cos²x

= 3cos²x - 2

cos²x = (1-sin²x)

LHS= cos²x - 2 sin²x

=1-sin²x - 2 sin²x

= 1-3sin²x

7 0

3 years ago

Is 3(5b - 2) and 8b - 5 equivalent

ch4aika [34]

Answer:

Step-by-step explanation:

4 0

2 years ago

Read 2 more answers

A phone company offers two monthly plans. Plan A costs 14 plus an additional 0.09 for each minute of calls. Plan B costs 18 plus

Sliva [168]

Answer:

200 minutes

Step-by-step explanation:

14 + 0.09 x = 18 + 0.07 x

0.09 x - 0.07 x = 18 - 14

0.02 x = 4

x = 400/2 = 200

8 0

3 years ago

What is the area of the cross section if the length is 12 cm and the width is 10 cm?

VARVARA [1.3K]

Answer:

120 cm²

Step-by-step explanation:

From the question;

Length is 12 cm
Width is 10 cm

We are required to determine the area of the cross section;

Note that the cross section is the plane of a solid that remains constant through the solid.
In this case, the cross section is a rectangle whose dimensions are 12 cm by 10 cm.

But Area of a rectangle = Length × Width

Therefore;

Area of cross section = 12 cm × 10 cm

= 120 cm²

Thus, area of the cross section is 120 cm²

6 0

3 years ago

Which line is parallel to the line<br> shown below?

Travka [436]

<h3>Answer: Choice D</h3>

4x - 3y = 15

====================================================

Explanation:

The two points (-1,-1) and (2,3) are marked on the line

Let's find the slope of the line through those two points.

$(x_1,y_1) = (-1,-1) \text{ and } (x_2,y_2) = (2,3)\\\\m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}\\\\m = \frac{3 - (-1)}{2 - (-1)}\\\\m = \frac{3 + 1}{2 + 1}\\\\m = \frac{4}{3}\\\\$

The slope is 4/3 meaning we go up 4 and to the right 3.

-------------

Parallel lines have equal slopes, but different y intercepts. We'll need to see which of the four answer choices have a slope of 4/3.

Solve the equation in choice A for y. The goal is to get it into y = mx+b form so we can determine the slope m.

$3x + 4y = -4\\\\4y = -3x-4\\\\y = -\frac{3}{4}x-\frac{4}{4}\\\\y = -\frac{3}{4}x-1$

Equation A has a slope of -3/4 and not 4/3 like we want.

Therefore, this answer choice is crossed off the list.

Follow similar steps for choices B through D. I'll show the slopes of each so you can check your work.

slope of equation B is 3/4
slope of equation C is -4/3
slope of equation D is 4/3

We have a match with equation D. Therefore, the equation 4x-3y = 15 is parallel to the given line shown in the graph.

You can use graphing tools like Desmos or GeoGebra to confirm the answer.

4 0

1 year ago