2 years ago

50 POINTS

Mathematics

2 answers:

Kruka [31]2 years ago

7 0

Answer:

it is to help me out but the answer is 59-=9x67-=7

Step-by-step explanation:

the answer is 7

Alex73 [517]2 years ago

4 0

Answer:

The answer is 59-=9x67-=7.

Step-by-step explanation:

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Sum of three numbers in an as is 33 and the sum of thier cubes is 5049.find the numbers

Alex73 [517]

Sum of three numbers is 33 and sum of their cubes is 5049 then three numbers are 7,11,15 or 15,11,7.

As given,

Let a-d, a, a +d be three numbers

Sum =33

⇒a-d + a +a +d =33

⇒ a =11

Sum of cubes= 5049

⇒ (a-d)³ + a +(a +d)³ =5049

⇒ a³ -d³ -3a²d +3ad² + a³ +a³ +d³ +3a²d +3ad² =5049

⇒3a³ + 6ad² = 5049

⇒ d=± 4

Therefore, sum of three numbers is 33 and sum of their cubes is 5049 then three numbers are 7,11,15 or 15,11,7.

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9 months ago

Let u = <5, 6>, v = <-2, -6>. Find -2u + 5v.

klio [65]

-2(5,6)-40 I think that's it

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2 years ago

If the diameter of circle a measures half of the diameter of circle b, then the area of circle b is how many times the area of c

Eduardwww [97]

Circle b:

Diameter = x

Radius = $\frac{x}{2}$

Area = $\pi r^{2} = \pi ( \frac{x}{2} )^{2} = \frac{ \pi x^{2} }{4}$

Circle a:

Diameter = $\frac{x}{2}$

Radius = $\frac{x}{2} * \frac{1}{2} = \frac{x}{4}$

Area = $\pi r^{2} = \pi ( \frac{x}{4} )^{2} = \frac{ \pi x^{2} }{16}$

Thus,

Area of circle b to area of circle a

= $\frac{ \pi x^{2} }{4}$ ÷ $\frac{ \pi x^{2} }{16}$

= $\frac{ \pi x^{2} }{4}$ × $\frac{ 16 }{\pi x^{2}}$

= 4

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2 years ago

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Out of £20 pocket money Rachel spends £13.50 expressed as a percentage

prohojiy [21]

13.50 : 20 = x : 100

x = $\frac{13.5 * 100}{20}$