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3 years ago

Please help ASAP! Taking my Algebra 1 Mid-Term right now!!!

Mathematics

2 answers:

prohojiy [21]3 years ago

4 0

Answer:

see explanation

Step-by-step explanation:

note that $\sqrt{a}$ × $\sqrt{a}$ = a

To rationalise the denominator multiply the numerator/ denominator by $\sqrt{180y}$

= $\frac{2\sqrt{108} }{\sqrt{180y} }$ × $\frac{\sqrt{180y} }{\sqrt{180y} }$

= (2 × 6 $\sqrt{3}$ × 6 $\sqrt{5y}$ ) / 180y

= $\frac{72\sqrt{15y} }{180y}$ = $\frac{2\sqrt{15y} }{5y}$

aleksley [76]3 years ago

4 0

The answer is A sir omg

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Triangle def is equilateral. If the perimeter of def is 36, the length of de is 5x-8, then what is the value of x

My name is Ann [436]

Answer:

Step-by-step explanation:

All the sides of an equilateral triangle are equal, hence the perimeter is expressed as P = 3s

s is one of the side length

Given DE = 5x - 8

P = 3DE

P = 3(5x-8)

36 = 3(5x-8)

36/3 = 5x-8

12 = 5x - 8

5x = 12+9

5x = 20

x = 20/4

x = 4

Hence the value of x is 4

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3 years ago

How do you solve supplementary angles when there is a number and an x where the angle should be?

weqwewe [10]

Answer:

We can calculate supplementary angles by subtracting the given one angle from 180 degrees. To find the other angle, use the following formula: ∠x = 180° – ∠y or ∠y = 180° – ∠x where ∠x or ∠y is the given angle.

Step-by-step explanation:

I hope it helps

have a nice day

6 0

3 years ago

12.8 x 3/4 I don’t know it

scoray [572]

48/5 or 9 3/5

12.8/1 x 3/4 = 38.4/4

Or multiply 12.8/1 by 10 ==> 128/10

128/10 x 3/4 = 384/40

Hope this helps!

7 0

3 years ago

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To the nearest cent what is $47.40 decreased by 58%

Rashid [163]

4700 is the answer hope it helps

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4 years ago

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A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimat

REY [17]

(a) 404 subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% confidence.

(b) When the confidence level decreases to 95%, the number of subjects decreases from 404 to 234.

<u>Explanation:</u>

Given:

σ = 15.6

Let the number of subjects be n

(a)

When the confidence level is 99%, then z = 2.576

E = 2

We know:

$n = [\frac{z X s}{E}]^2$

On substituting the value, we get:

$n = [\frac{2.576 X 15.6}{2} ]^2\\\\n = 403.7$

Thus, 404 subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% confidence.

(b)

When the confidence level is 95%, then z = 1.96

E = 2

We know:

$n = [\frac{z X s}{E}]^2$

On substituting the value, we get:

$n = [\frac{1.96 X 15.6}{2} ]^2\\\\n = 233.7$

n = 234

Thus, when the confidence level decreases to 95%, the number of subjects decreases from 404 to 234.

8 0

3 years ago