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3 years ago

9

Jamaal has 20 models of planes and cars. He has three times as many cars as planes. What is the ratio of his cars to total model

s?

1 answer:

yarga [219]3 years ago

3 0

Well... Can you tell me how many planes he has?
Also... Can you multiply the number of planes by 3?

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Pls help me guys I'm so stuck on this!

Nikitich [7]

$x+x+x+5+5=3x+10$

7 0

3 years ago

Read 2 more answers

Please solve this simultaneous equation, i'm not that good at it.<br><br> 2r-s=10<br> rs-s^2=12

o-na [289]

Answer:

s = 6, r = 8 or s = 4, r = 7

Step-by-step explanation:

2r - s = 10

2r = 10 + s

r = 5 + s/2 --(1)

rs - s^2 = 12 --(2)

sub (1) into (2):

(5 + s/2)s - s^2 = 12

5s + 0.5s^2 - s^2 = 12

-0.5s^2 + 5s - 12 = 0

s^2 - 10s + 24 = 0

(s - 6)(s - 4) = 0

therefore s = 6 or s = 4

when s = 6, r = 8 and when s = 4, r = 7

if you would like to discover more about simultaneous equations, you can have a look at my Instagram page (learntionary). I'll be posting mathematics related stuff there and some of my notes (simultaneous enq notes are already posted!)

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2 years ago

Kuri spent a total of $68 on trading cards. His collection contains two types of cards. A pack of trading card A $4 and a pack o

masya89 [10]

Answer:

8 of Card B and 3 of card A. Hope this helps

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3 years ago

Read 2 more answers

I need help thanks !

oksano4ka [1.4K]

U say the answer is D 7$......

3 0

3 years ago

A sample of gold has a mass of 579 g. The volume of the sample is 30 cm3. What is the density of the gold sample?

Ugo [173]

The density of the gold sample is 19.3g/cm³

Let the mass of the gold sample be represented by m

m = 579 g

Let the volume of the gold sample be represented by V

V = 30 cm³

Let the density of the gold sample be represented by ρ

The formula for the density is:

$Density = \frac{Mass}{Volume}$

$\rho = \frac{m}{V} \\\rho = \frac{579}{30} \\\rho = 19.3 g/cm^3$

The density of the gold sample is 19.3g/cm³

Learn more here: brainly.com/question/17780219

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3 years ago