Can someone please help me i don’t know what to do on this

Mathematics

2 answers:

Savatey [412]2 years ago

5 0

Answer:

I would say 20 or 30

Step-by-step explanation:

if y=15 and x=3 and than x=4 than y would be 20 or 30

Musya8 [376]2 years ago

3 0

Answer:

4/5

Step-by-step explanation:

y is 5 times as big as x

When y is 4, divide it by 5 to find x

x = 4/5

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2 Points

liraira [26]

Two or zero expresses the possible number of positive real solutions for the given polynomial equation.

Answer: Option D

Step-by-step explanation:

Given equation:

$x^{3}-4 x^{2}-7 x+28=0$

First, we put hit and trial method to find out the one solution. So, if we put x=4 then the above expression will become zero. We can also write the above expression as

$(x-4) \times\left(x^{2}-7\right)=0$

We know the formula, $a^{2}-b^{2}=(a+b)(a-b)$ , make use of this, we get

$(x-4) \times(x-\sqrt{7}) \times(x+\sqrt{7})=0$

So, $x=4, \sqrt{7},-\sqrt{7}$

Hence, from the above expression, we have three values of x as x= 4, 2.64 and -2.64

8 0

3 years ago

Pamela wants to buy a suitcase whose dimensions are 1 1/2 times those of her 28 times 16 times 8 inch suitcase. How is the ratio

trapecia [35]

Multiply the dimensions by 1.5 and Pamela's suitcase becomes 42" x 24" x 12".

Volume of 28" x 16" x 8": 3584 in^3 

Volume of 42" x 24" x 12": 12,096 in^3 

The volume ratio is 3.375, and yes, you have to cube it.

8 0

3 years ago

Read 2 more answers

A kite with a 100 foot-long string is caught in a tree. When the full length of the string is stretched in a straight line to th

spayn [35]

Hyp=100,adj side=30

angle= $cos^{-1}(30/100)$