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3 years ago

I NEED HELP WITH THIS FAST!

Mathematics

1 answer:

iren2701 [21]3 years ago

4 0

Answer:

Step-by-step explanation:

Easy C

That is a really hard one but i gotch you

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Let sin A= -3/5 with 270°< A< 360°. Find the following.<br> sin A/2

GREYUIT [131]

Answer:

1/sqrt10

Step-by-step explanation:

1) Find out cosA using formula (cosA)^2+(sinA)^2=1

The module of cosA= sqrt (1- (-3/5)^2)= sqrt 16/25=4/5

So cosA=-4/5 or cosA=4/5.

Due to the condition 270degrees< A<360 degrees, 0<cosA<1 that's why cosA=4/5.

2) Find sinA/2 using a formula cosA= 1-2sinA/2*sinA/2 where cosA=4/5.

(sinA/2)^2= 0.1

sinA= sqrt 0.1= 1/ sqrt10 or sinA= - sqrt 0.1= -1/sqrt10

But 270°< A< 360°, then 270/2°<A/2<360/2°

135°<A/2<180°, so sinA/2 must be positive and the only correct answer is

sin A/2= 1/sqrt10

6 0

3 years ago

C+1(4-3c)-2=0 helpppppp plzz

scoray [572]

C+4-30-2=0
-2c+2=0
-2 -2

C=1

5 0

3 years ago

Can some one please help me with this math question? Please and thank you

Bond [772]

Answer:

$V = 6373.2cm^3$

Step-by-step explanation:

Given

$V = \frac{4}{3}\pi r^3$ --- Volume

$D = 23cm$ --- Diameter

Required

Find the volume

First, we calculate the radius, r

$r = \frac{1}{2}D$

Substitute 23 for D

$r = \frac{1}{2} * 23$

$r = 11.5$

Substitute 11.5 for r in $V = \frac{4}{3}\pi r^3$

$V = \frac{4}{3} * \frac{22}{7} * 11.5^3$

$V = \frac{4*22*11.5^3}{3*7}$

$V = \frac{133837}{21}$

$V = 6373.19047619$

$V = 6373.2cm^3$

5 0

3 years ago

How do you find 5% of 250

Akimi4 [234]

Answer:

$250 \times \frac{5}{100} = 12.5$

...................................................

3 0

2 years ago

This right triangle has one leg with a length of 45 units and a hypotenuse with a length of 75 units. What is the length of the

Nesterboy [21]

The length of other leg is 60 units.

Step-by-step explanation:

Given,

Length of one leg = a = 45 units

Length of other leg = b

Length of hypotenuse = c = 75 units

Using pythagoras theorem

$a^2+b^2=c^2\\(45)^2+b^2=(75)^2\\2025+b^2=5625\\b^2=5625-2025\\b^2=3600$

Taking square root on both sides

$\sqrt{b^2}=\sqrt{3600}\\b=60\ units$

The length of other leg is 60 units.

Keywords: Pythagorean theorem, square root

Learn more about square root at:

#LearnwithBrainly

4 0

3 years ago