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3 years ago

12

Boris rides around a 800 metre track recording his speed each time. In

1 answer:

slega [8]3 years ago

8 0

Answer:

The easiest way to work out average times is to convert them all to seconds. 60 secs makes 1 min etc. Add all the seconds. Then divide the sum by the number of entries, hope this works.

Step-by-step explanation:

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It says to do 81^3/4 and i don’t know how to simplify that

scoundrel [369]

$\bf 81^{\frac{3}{4}}~~ \begin{cases} 81=&3\cdot 3\cdot 3\cdot 3\\ &3^4 \end{cases}\qquad \implies (3^4)^{\frac{3}{4}}\implies 3^{4\cdot \frac{3}{4}}\implies 3^1\implies 3$

7 0

3 years ago

Find the value of x. 7, 8, and 9 please!

natima [27]

Answer:

7) x= 5, 8) x= 6, 9) x= 7

Step-by-step explanation:

As per the secant theoram, if two secant intersect outside the circle then the product of the exterior secant and total length of each secant are equal.

7) ∴ $(x+3)\times 3= (10+2)\times 2$

opening parethesis and distributing 3 with x and 3.

⇒ $3x+9=24$

subtracting 9 on both side.

⇒ $3x=15$

cross multiplying

∴ x= 5.

8) $(3+5)\times 5= (x+4)\times 4$

Opening parethesis and distributing 4 with x and 4.

⇒ $8\times 5=4x+16$

⇒ $40=4x+16$

subtracting 16 on both side.

⇒ $24=4x$

cross multiplying

∴ x= 6.

9) $(x+5)\times 5= (6+4)\times 6$

opening parethesis and distributing 5 with x and 5.

⇒ $5x+25=60$

subtracting 25 on both side.

⇒ $3x=35$

cross multiplying

∴ x= 7.

6 0

3 years ago

Which expression represents 12x³-6x²+2x ÷2x in simplest form?

Elden [556K]

Answer:

x^2 (12 x - 5)

Step-by-step explanation:

Simplify the following:

12 x^3 + (2 x x)/2 - 6 x^2

(2 x x)/2 = 2/2×x x = x x:

12 x^3 + x x - 6 x^2

x x = x^2:

12 x^3 + x^2 - 6 x^2

x^2 - 6 x^2 = -5 x^2:

12 x^3 + -5 x^2

Factor x^2 out of 12 x^3 - 5 x^2:

Answer: x^2 (12 x - 5)

5 0

4 years ago

I need some help finding the volume of a sphere with a diameter of 18.6cm. The website says the answer I got from my calculator

777dan777 [17]

Answer:

V = 3,367.6 cm³

Step-by-step explanation:

Diameter of sphere (D) = 18.6 cm

radius (r) = ½(18.6) = 9.3

π = 3.14

Formula for volume of a sphere = ⁴/3πr³

Plug in the values

V = ⁴/3 × 3.14 × 9.3³

V = ⁴/3 × 3.14 × 804.357

V = (4*3.14*804.357)/3

V = 3,367.57463

V = 3,367.6 cm³ (nearest tenth)

6 0

3 years ago

The width of a rectangle is modeled by the function w(x) = 3x – 6, and the length of the rectangle is modeled by the function l(

Inessa [10]

Answer:

15x^2 - 9x - 42

Step-by-step explanation:

(3x+6)(5x+7)

15x^2 +21x - 30x -42

15x^2 - 9x - 42

7 0

3 years ago