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S_A_V [24]
3 years ago
10

Solve the equation. -7b=21

Mathematics
2 answers:
lesantik [10]3 years ago
8 0

Step-by-step explanation:

-7b=21

Divide both sides by - 7

B= -3

Kipish [7]3 years ago
7 0

Answer:

b=-3

Step-by-step explanation:

-7b=21

-7b/-7=21/-7

b=-3

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Look at the figure and answer
andreyandreev [35.5K]

Answer:

\cos x=\dfrac{8}{f}

Step-by-step explanation:

Given that,

\tan x=\dfrac{e}{8}\\\\\sin x=\dfrac{e}{f}

We need to find the value of cos x.

We know that,

\tan\theta=\dfrac{\sin\theta}{\cos\theta}

Using the above relation,

\dfrac{e}{8}=\dfrac{\dfrac{e}{f}}{\cos x}\\\\\cos x=\dfrac{\dfrac{e}{f}}{\dfrac{e}{8}}\\\\=\dfrac{e}{f}\times \dfrac{8}{e}\\\\=\dfrac{8}{f}

So, the value of cos x is equal to \dfrac{8}{f}.

7 0
3 years ago
Solve for w. 42 = 7/2w. Simplify your answer as much as possible.
SOVA2 [1]

Answer:

3

Step-by-step explanation:

7 times 2 = 14 14 times 3 equals 42 ur welcome

4 0
2 years ago
Read 2 more answers
What two numbers multiply to -8 and add to -4
Ronch [10]

Answer:

  -2-2√3, -2+2√3

Step-by-step explanation:

Let x represent one of the numbers. Then the other number is -4-x. We want the product to be -8:

  x(-4-x) = -8

  -4x -x^2 = -8 . . . . . eliminate parentheses

  x^2 +4x = 8 . . . . . . multiply by -1

  x^2 +4x +4 = 12 . . . add 4 to complete the square

  (x +2)^2 = 12

  x +2 = ±√12 = ±2√3

  x = -2±2√3

The two numbers are -2-2√3 ≈ -5.4641, and -2+2√3 ≈ 1.4641.

7 0
3 years ago
In our solar system 6 of the 8 planets have moons what is the percentage of the planet have moons
umka2103 [35]
75% for your help:)…….
8 0
2 years ago
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A triangle has an area of 64 square feet. If the height of the triangle is 8 feet more than its base, x, what are its height and
Nitella [24]

Answer:

8 feet

Step-by-step explanation:

Given data

Area= 64 square feet

Base= x feet

Height= x+8 feet

The expression for the area

A= 1/2b*h

substitute

64= 1/2*x*(x+8)

64= 1/2*x^2+8x

64= (x^2+8x)/2

cross multiply

64*2= x^2+8x

128= x^2+8x

rearrange

x^2+8x-128= 0

using the quadratic formula

a=1

b=8

c=-128

x= -b±√b^2-4ac/2a

x= -1±√8^2-4*1*-128/2*1

simplifying

x= 8

x=-16

Hence the height of the base is

h= 8 feet

7 0
2 years ago
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