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nydimaria [60]
4 years ago
14

-16=-3(7a+8) what is a

Mathematics
1 answer:
user100 [1]4 years ago
6 0

-16=-3(7a+8)

multiply the bracket by -3

(-3)(7)=-21

(-3)(80=-24

-16=-21a-24

move -24 to the other side

sign changes from -24 to +24

-16+24=-21a-24+24

8=-21a

divide both sides by -21 to get a by itself

8/-21=-21a/-21

answer:

a=-8/21

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How do you do this?!<br> (2w-1)/(4)=(2-w)
nikklg [1K]

Answer:

w = 3 is your answer.

Step-by-step explanation:

You want to get w by itself.

<em>(2w - 1)/(4) = 2 - w         </em><u>You will add the w on both sides.</u>

<em>(3w - 1)/(4) = 2                </em><u>You will multiply 4 on both sides.</u>

<em>3w - 1 = 8                       </em><u>You will add 1 on both sides.</u>

<em>3w = 9                            </em><u>You will divide 3 on both sides.</u>

w = 3 is your answer.

6 0
3 years ago
A metallic sphere is immersed in water in a cylindrical container causing a rise in the level of water by 7.5cm if the cylinder
SVETLANKA909090 [29]

Answer:

6.51 cm

Step-by-step explanation:

Since the sphere causes the water level in the cylindrical container to rise and thus increase by its own volume, the volume of the sphere is V = 4πr³/3 where r = radius of sphere. The volume rise of the container is thus    V' = πR²h where R = radius of base of cylinder = 7 cm and h = height of water level = 7.5 cm.

Since V = V',

4πr³/3 = πR²h

dividing through by π, we have

4r³/3 = R²h

multiplying both sides by 3/4, we have

r³ = 3R²h/4

taking cube-root of both sides, we have

r = ∛(3R²h/4)

Substituting the values of the variables into the equation, we have

r = ∛(3(7 cm)² × 7.5 cm/4)

r = ∛(3 × 49 cm² × 7.5 cm/4)

r = ∛(1102.5cm³/4)

r = ∛(275.625 cm³)

r = 6.508 cm

r ≅ 6.51 cm to 2 decimal places

3 0
3 years ago
Hannah buys two CD's for $9.95 each and three CD's at $11.99 each. How much does she spend altogether?
olya-2409 [2.1K]
Just simplify the following equation

2 (9.95) + 3 (11.99)
19.90 + 35.97
55.87 spent
4 0
3 years ago
Read 2 more answers
Please show your workings
GarryVolchara [31]
13% of 4,760,000 = 618,800
4,760,000 + 618,800 = 5,378,800
Hope it helps!
6 0
3 years ago
(50 points) need help with khan practice geometry
Vedmedyk [2.9K]

The awnser is 60 because

It is a cube so it has the smae amout of sides

8 0
2 years ago
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