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3 years ago

AHHH what does x equal in this equation? a: x=5 b: x=3 c: x=8

Mathematics

2 answers:

Vikki [24]3 years ago

7 0

1+3=4
4x2=8
x=8
so x equals 8

Ghella [55]3 years ago

5 0

Answer:

c: x = 8

Step-by-step explanation:

To start isolating the variable, add 3 to both sides. This leaves you with x/2 = 4. To get rid of the fraction, multiply both sides by two. This gives you x = 8.

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If DX/DT= 2cm/s x=-1 y=x^2+1 DY/DT=??

kobusy [5.1K]

Answer:

$\frac{dy}{dt}$ = - 4 cm/s

Step-by-step explanation:

Let us revise the chain rule

If $\frac{dy}{dt}$ = a and $\frac{dx}{dt}$ = b, then

$\frac{dy}{dx}$ = $\frac{dy}{dt}$ ÷ $\frac{dx}{dt}$ = $\frac{a}{b}$

∵ y = x² + 1

- Use the differentiation to find $\frac{dy}{dx}$

∴ $\frac{dy}{dx}$ = 2x

∵ x = -1

- Substitute x by -1 in $\frac{dy}{dx}$

∴ $\frac{dy}{dx}$ = 2(-1)

∴ $\frac{dy}{dx}$ = -2

∵ $\frac{dy}{dt}$ = $\frac{dy}{dx}$ × $\frac{dx}{dt}$

∵ $\frac{dx}{dt}$ = 2 cm/s

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∴ $\frac{dy}{dt}$ = - 4 cm/s

8 0

3 years ago

A swing set is going to be placed over a region of mulch that is shaped like a trapezoid. The bases of the trapezoid have a leng

shutvik [7]

Answer:

114.8

Step-by-step explanation:

The formula for a trapezoid is ((a+b/2)h

You need to plug everything in, ((12+15)/2)8.5= 114.8

6 0

3 years ago

Solve the following system of equations. 2x + 5y = -18 and y = -4x

andriy [413]

Answer:

x=1 and y= -4

Step-by-step explanation:

step one: plug -4x into y in thi]e first equation.

2x+5(-4)= -18

step two: solve for x

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(add 20 to both sides to eliminate -20 on the right)

2x=2

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x=1

step 3: now that we found the value for x plug it in to either equation and solve for y

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3 years ago

A triangle has sides of length 12 miles, 9.6 miles, and 7.2 miles. What is the perimeter?

Anna71 [15]

12+ 9.6+ 7.2=28.8 miles is the perimeter
28.8

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3 years ago

Read 2 more answers

What is the y-intercept of the line y=4x-3?

Kobotan [32]

(0,-3) because that’s what it is

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3 years ago