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3 years ago

X^2+y^2=y in polar form

1 answer:

5 0

Replace x^2+y^2 with r^2. Also replace y with r*sin theta.

Then we have r^2 = r*sin theta.

this can be reduced to r = sin theta.

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A large random sample of American students in seventh grade showed that 20%20\% 20% 20, percent of them were reading below grade

WITCHER [35]

Answer:

The answer is A i must took the test

Step-by-step explanation:

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3 years ago

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A 15 ft. telephone pole has a wire that extends from the top of the pole to the ground. The wire and the ground form a 42° angle

Lorico [155]

Answer:

Correct choice is A

Step-by-step explanation:

Consider right triangle ABC formed by the telephone pole (side AB) and ground (side BC). In this triangle AC is the length of the wire, BC is the distance from the base of the pole to the spot where the wire touches the ground and AB=15 ft, ∠ACB=42°.

Then

$\sin 42^{\circ}=\dfrac{AB}{AC}\Rightarrow AC=\dfrac{AB}{\sin 42^{\circ}}=\dfrac{15}{\sin 42^{\circ}}\approx 22.4\ ft.$
$\tan 42^{\circ}=\dfrac{AB}{BC}\Rightarrow BC=\dfrac{AB}{\tan 42^{\circ}}=\dfrac{15}{\sin 42^{\circ}}\approx 16.7\ ft.$

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3 years ago

What is the square root of 4

Nina [5.8K]

Answer:

The square root of 4 is 2 because 2 times itself produces 4

2 * 2 = 4

Step-by-step explanation:

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3 years ago

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Please help me on letter C and E only,ASAP

algol13

Answer:

c-76 and d-68

Step-by-step explanation:

a=2(wl+hl+hw)

Please mark brainliest if this helps and ask more questions if you need to!

3 0

3 years ago

I need help on this ! Asap

Gnoma [55]

Answer:

1. Given

2, Exterior sides on opposite rays

3. Definition of supplementary angles

4. If lines are ||, corresponding angles are equal

5. Substitution

Step-by-step explanation:

For the first one, it is given as shown in the problem. Also in the figure you can see that line s is parallel to line t.

2. ∠5 and ∠7 are adjacent, they share a common side. Their non-common side are rays that go in a direction opposite of each other. Also you can see that they form a straight line, which means that they are supplementary.

3. Supplementary angles simply put are angles that sum up to 180°. You know this for sure because of proof 2, specifically the part that they form a straight line. The measure of a straight line is 180°.

4. Corresponding angles are congruent. These are angles that have the same relative position when a line is intersected by parallel lines. You have other example in the figure like ∠2 and ∠6; ∠3 and ∠7.

5. This is substitution because ∠1 substituted ∠5 in this case. Since ∠1 is equal to ∠5, then it can substitute it in the equation given in step 3. This means that ∠1 and ∠7 are supplementary as well.

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3 years ago