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Vikki [24]
2 years ago
9

Factor completely: 7r^2− 64r + 64

Mathematics
1 answer:
poizon [28]2 years ago
8 0

Answer:

7r^2-64r+64

49r-64r+64

-15r+64

Step-by-step explanation:

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What percent of 60 is 15?
kvasek [131]
Well the first one you have to divide both sides by 60 to get x. 
=60x/60=1500/60 
x=25
your answer is 25%

second one...think of it as 18/50. multiply by 2 and you get 36/100 
your answer is 36%
4 0
3 years ago
Read 2 more answers
Solve the triangle. Round your answers to the nearest tenth.
Tresset [83]

Answer:

<B = 47°

<C = 28°

b = AC = 28.0

Step-by-step explanation:

Given:

∆ABC

AB = c = 18

BC = a = 37

<A = 105°

Required:

Length of AC = b

measure of angle B and angle C

SOLUTION:

==>Use the sine rule, sin A/a = sinC/c to find the angle of C:

SinA = sin(105) = 0.9659

a = 37

sinC = ?

c = 18

0.9659/37 = sinC/18

Cross multiply

0.9659*18 = 37*sinC

17.3862 = 37*sinC

Divide both sides by 37

17.3862/37 = sinC

0.4699 = sinC

sinC = 0.4699

C = Sin-¹(0.4699)

C = 28.0° (nearest tenth)

==>Find angle B using sum of angles in a triangle:

Angle B = 180 - (105+28)

Angle B = 180 - 133

Angle B = 47°

==>Find length of b using sine rule, b/sinB = c/sinC:

SinC = sin(28) = 0.4695

SinB = sin(47) = 0.7314

c = 18

b = ?

b/0.7314 = 18/0.4695

Cross multiply

b*0.4695 = 18*0.7314

b*0.4695 = 13.1652

Divide both sides by 0.4695

b = 13.1652/0.4695

b = 28.0 (nearest tenth)

6 0
3 years ago
Miguel needs $99.95 to buy himself a pair of Beats headphones. He has 1/5 of the money saved already. How much money has he save
kumpel [21]

$19.99

1/5 = 0.20

$99.95 X 0.20 = $19.99

7 0
2 years ago
Make sure your answer is in
romanna [79]

Answer:

210° , 330°

Step-by-step explanation:

using the sides of the 30- 60- 90 triangle

with legs 1, \sqrt{3} and hypotenuse 2 , then

sin^{-1} \frac{1}{2} = 30° ← related acute angle

since sin^{-1} - \frac{1}{2}

then angle is in third / fourth quadrants , then required angles are

180° + 30° = 210° ← in third quadrant

360° - 30° = 330° ← in fourth quadrant

6 0
2 years ago
What is x to the 3 power
Natasha_Volkova [10]

Answer:

x to the third power is x cubed or x^3.

6 0
3 years ago
Read 2 more answers
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