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mina [271]
4 years ago
9

Directions: place the parentheses in the expression so that it equals the given value.

Mathematics
1 answer:
Bezzdna [24]4 years ago
6 0

12 • (2 + 2³) = 12 • (2 + 8) = 12 • 10 = 120

(7² + 1 - 5) • 3 = (49 + 1 - 5) • 3 = (50 - 5) • 3 = 45 • 3 =135


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What value of θ makes cosθ = sin70° a true statement?<br> A) 20° <br> B) 40° <br> C) 70° <br> D) 90°
Delvig [45]

Answer:

A) 20°

Step-by-step explanation:

Sine and cosine are co-function complements which means that value of sine of an angle is equal to the value of cosine of the complementary angles.

This can be represented by:

\sin\theta=\cos(90\°-\theta)

\cos\theta=\sin(90\°-\theta)

Given statement:

cos\theta=\sin70\°

Applying co-function complements

\cos\theta=\sin(90\°-\theta)

Since, we can represent 70° = 90°-20°

So

\cos20\°=\sin(90\°-20\°)  

Thus, \theta=20\° makes the statement true.

3 0
3 years ago
What is the difference between intersecting and perpendicular lines? Can two lines exist that are not intersecting or parallel?
sertanlavr [38]
Intersecting lines are lines that meet at some point while perpendicular lines are intersecting lines that makes a right angle at the point of intersection.

Two line can either be intersecting or perpendicular. It is not possible to have two line that is neither intersecting or parallel.
7 0
3 years ago
Someone please help I will mark you as brainliest
irakobra [83]

Answering pretty sure yes

Step-by-step explanation:

7 0
3 years ago
The distance between Alison's school and home is 12.5 miles. If 5 miles is 8 kilometers, how many kilometers is her school
raketka [301]

Answer:

20km

jus split it up into parts\

5+5+2.5=12.5

8+8+4=20

8 0
3 years ago
Read 2 more answers
What is the slope of a line perpendicular to the line whose equation is 2y=-6x+8
Effectus [21]

2y=-6x+8

First, the slope of any equation, is always the coefficient with the variable "x".

So, the slope for this line, is -6x.

To get rid of the coefficient with y, we need to divide 2, from both sides of the equal sign.

<u>2y=-6x+8</u>

      2

y=-3+4

Now that we have our new equation, we can see that the slope of our line has also changed, from -6x to-3x. Because -6÷2=-3.

And to find the perpendicular slope, you change the reciprocal of the slope so from -3 to  1/-3 and then you change the sign of the slope so from 1/-3 to 1/3. That is your final answer.

The answer is 2) 1/3.


5 0
3 years ago
Read 2 more answers
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