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3 years ago

Given that y varies directly with x and y = 42 when x = 14, find y when x =90.

Mathematics

1 answer:

Anvisha [2.4K]3 years ago

3 0

Direct Variation equation: y=kx, k=y/x
42/14=3
k=3
y=3x
y=3(90)
y=270

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3 years ago

Find the domain of h(x)=x-3/x^3-36x

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There is some ambiguity here which could be removed by using parentheses. I'm going to assume that you actually meant:

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3 years ago

Lisa is 10 cm taller than her friend ian. Ian is 14 cm taller than jim. Every month, their heights increase by 2 cm. In 7 months

koban [17]

Answer: Ian's height = x+14 = 69+14 = 83 cm

Explanation :

Let the height of Jim be x

Let the height of Ian be x+4

Let the height of Lisa be x+4+10=x+14

Since their heights increase by 2cm every months

so after 7 months ,

Jim's height = x+14

Ian's height= x+4+14=x+18

Lisa's height= x+14+14=x+28

According to question,

Sum of Ian's and Jim's height = 170cm

$x+18+x+14 = 170\\2x+32 =170\\2x =170-32\\2x = 138$

⇒x = $\frac{138}{2}$

⇒ x= 69cm

∴ Ian's height = x+14 = 69+14 = 83 cm

5 0

3 years ago

Read 2 more answers