3 years ago

A number is added to the square of itself and the result is 90. Find all possible values for the number

Mathematics

1 answer:

kolezko [41]3 years ago

6 0

Answer: 9

Step-by-step explanation: 9 x 9 equals 81 and 81 add 9 is 90

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25. The heights of three-year-old boys are Normally distributed with a mean of

mario62 [17]

1.29 just add them your welcome

7 0

2 years ago

A tree cast a shadow of 30m long and a 2m stick casts one that is 3m long. As show in the below diagram how tall is the tree?

PSYCHO15rus [73]

Answer:

20 m

Step-by-step explanation:

<u>We have similar triangles here.</u>

BC║DE, AB║AD and AC║AE ⇒ ΔADE ~ ΔABC

<u>The ratio of corresponding sides of similar triangles is same:</u>

BC/DE = AC/AE
BC / 2 = 30/3
BC / 2 = 10
BC = 2*10
BC = 20 m

6 0

3 years ago

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Which expression is equivalent to this expression? x(2x+3) Question 1 options: 2x2+3 2x2+3x 2x2−3x 3x + 3

sleet_krkn [62]

Answer:

$2x^2+3x$ is the expression which is equivalent to $x\left(2x+3\right)$ .

In other words:

$x\left(2x+3\right)=2x^2+3x$

Step-by-step explanation:

Given the expression

$x\left(2x+3\right)$

solving

$x\left(2x+3\right)$

$\mathrm{Apply\:the\:distributive\:law}:\quad \:a\left(b+c\right)=ab+ac$

$a=x,\:b=2x,\:c=3$

$=x\cdot \:2x+x\cdot \:3$

$=2xx+3x$

$=2x^2+3x$ ∴ $2xx=2x^2$

Thus,

$x\left(2x+3\right)=2x^2+3x$

Therefore, $2x^2+3x$ is the expression which is equivalent to $x\left(2x+3\right)$ .

8 0

3 years ago

What is the next fraction in this sequence? Simplify your answer. 3/4, 1/4, 1/12, 1/36

antiseptic1488 [7]

Hey their,

3/4
1/4
1/12
1/36
0/60

The pattern is -1/x every 2 +x/8

How i got this was 36/12=3
3*12=36
so 60-36=24
24x3/2+24=60
then 60/5=12

Hopethis helped

7 0

3 years ago

Hello! Please help me! I'm not good at subtracting fractions!

mafiozo [28]

The answer in an improper fraction is
47/36

As a mixed number, it is 1 11/36

Hope you become an expert at this soon :)

3 0

3 years ago

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