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Phantasy [73]
3 years ago
6

The Area of a rectangle is 3x2 + 9x square inches. The length of the rectangle is 3x inches.

Mathematics
2 answers:
Ainat [17]3 years ago
4 0

A=3x^2+9x   I'm assuming is the equation for the area? with x being squared

L=3x

W=??

since we know the basic formula of area to be A=W*L, we can move it around to solve for W and get A/L=W. From here we can plug in the known values of A and L to solve for W.

A/L=W

(3x^2+9x)/(3x)=W

(3x(x+3))/3x=W

x+3=W

this gives you x+3=W, as both terms in the numerator contain 3x, which is the denominator.

specifically, I'd answer the questions like this.

1. To find the area of a rectangle, you must multiply the length times width

2. To find the width of a rectangle knowing the area and length, you must solve for the width using the formula for area by plugging in the known values for area and length

3. Work shown above

Roman55 [17]3 years ago
3 0

Width of the rectangle is x + 3 in

Step-by-step explanation:

  • Step 1: Given area of the rectangle = 3x² + 9x in². Length = 3x in. Find width.

Area = length × width

3x² + 9x = 3x × width

∴ Width = 3x² + 9x/3x = x + 3 in

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One of the legs of a right triangle is twice as long as the other, and the perimeter of the triangle is 35. Find the
Aloiza [94]

Answer:

6.68, 13.37, 14.95

Step-by-step explanation:

One of the legs is twice as long as the other.

b = 2a

The perimeter is 35.

35 = a + b + c

The triangle is a right triangle.

c² = a² + b²

Three equations, three variables.  Start by plugging the first equation into the second and solving for c.

35 = a + 2a + c

c = 35 − 3a

Now plug this and the first equation into the Pythagorean theorem:

(35 − 3a)² = a² + (2a)²

1225 − 210a + 9a² = a² + 4a²

1225 − 210a + 4a² = 0

Solve with quadratic formula:

a = [ -(-210) ± √((-210)² − 4(4)(1225)) ] / 2(4)

a = (210 ± √24500) / 8

a ≈ 6.68 or 45.82

Since the perimeter is 35, a = 6.68.  Therefore, the other sides are:

b ≈ 13.37

c ≈ 14.95

8 0
2 years ago
If P = (-2,7), Find:<br> Ry-axis (P)<br> ([?], [])
kumpel [21]

Answer:

(2, 7)

Step-by-step explanation:

R_{\text{y-axis}}(\text{P}) represents the reflection of a point P about the y-axis.

If a point (x, y) is reflected across y-axis, rule for the reflection is,

(x, y) → (-x, y)

If a point (-2, 7) follows the same rule, coordinates of the image point will be,

P(-2, 7) → P'(2, 7)

Therefore, answer is (2, 7).

8 0
3 years ago
What is the place value for 3 in 318,472,008
VikaD [51]
Salutations!

What is the place value for 318,472,008

The number 3 is in the place as hundred million.

In the numeric form, we can write the number as ------

300, 000, 000.

Hope I helped.
6 0
3 years ago
The deck of a bridge is suspended 275 feet above a river. If a pebble falls off the side of the bridge, the height, in feet, of
Ivenika [448]

Answer:

Our equation for the height is:

y(t) = 275 - 16*t^2.

a) To find the average velocity between two times, t1 and t2, (where t2 > t1) the equation is:

AV = \frac{y(t2) - y(t1)}{t2 - t1}

Then:

i) t1 = 4s, t2 = 4s + 0.1s = 4.1s

The average velocity is:

AV = \frac{(275 - 16*4.1^2) - (275 - 16*4^2)}{4.1 - 4} = \frac{16(4^2 - 4.1^2)}{0.1} = -129.6

And the units will be ft/s, so the average speed is:

-129.6 ft/s

The minus sign is because te pebble is falling down.

ii)  t1 = 4s, t2 = 4s + 0.05s = 4.05s

The average velocity is:

AV = \frac{(275 - 16*4.05^2) - (275 - 16*4^2)}{4.05 - 4} = \frac{16(4^2 - 4.05^2)}{0.05} = -128.8

So the average speed is -128.9 ft/s

iii)  t1 = 4s, t2 = 4s + 0.01s = 4.01s

The average speed is:

AV = \frac{(275 - 16*4.01^2) - (275 - 16*4^2)}{4.01 - 4} = \frac{16(4^2 - 4.01^2)}{0.01} = -128.16

The average speed is -128.16 ft/s.

b) The instantaneous velocity of the pebble after 4 seconds can be obtained by looking at the velocity equation, that is the derivative of the height equation.

v(t) = dy(t)/dt.

v(t) = -2*16*t + 0

Then the velocity at t = 4s is:

v(4s) = -32*4 = -128

The instantaneous velocity at t = 4s is -128 ft/s.

3 0
3 years ago
If a =7 inches and c = 14 inches in a right angle, then what is the measure of angle a
strojnjashka [21]

Answer:

Its 63.435

Step-by-step explanation:

https://www.calculator.net/triangle-calculator.html?vc=&vx=7&vy=&va=90&vz=14&vb=&angleunits=d&x=104&y=23

I always used this when it came to triangles

7 0
3 years ago
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