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3 years ago

13

Yoku is putting on sunscreen. He uses

1 answer:

aleksley [76]3 years ago

4 0

For this case we can make the following rule of three:
2 ml -------------> 50cm ^ 2
c -----------------> 325 cm ^ 2
From here, we clear the value of c.
We have then:
c = (325/50) * (2)
c = 13 ml
Answer:
I need 13 milliliters of sunscreen to cover his skin.

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(2x+10)+(2x-30) please help me

Sonja [21]

Answer:

4x-20

Step-by-step explanation:

2x + 2x =4x

10 + (-30) = -20

put it together!

4x-20

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3 years ago

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NEED ASAP 100 POINTS!!!!!!!!!

Charra [1.4K]

Answer:

3) a. f(-4) = 2

b. f(0) = 0

c. f(3) = -1.5

d. f(-5) = 0

e. x = -4

f. x= 0

4) a. f(-1) = 1

b. f(3) = -1

c. 1

d. -5

5) f(6) = 2

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3 years ago

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The number of hours that a nine month old baby sleeps at night are normally distributed with a population standard deviation of

finlep [7]

Answer:

The margin of error for a confidence interval for the population mean with a 90% confidence level is 0.53 hours.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this quesstion:

$\sigma = 1.5, n = 22$

So

$M = 1.645*\frac{1.5}{\sqrt{22}} = 0.53$

The margin of error for a confidence interval for the population mean with a 90% confidence level is 0.53 hours.

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3 years ago

What would x be for this to be true -4x=5

Rom4ik [11]

Answer:

x = -5/4

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS<u> </u>

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality<u> </u>

<u>Algebra I</u>

Terms/Coefficients

Step-by-step explanation:

<u>Step 1: Define</u>

-4x = 5

<u>Step 2: Solve for </u><em><u>x</u></em>

[Division Property of Equality] Divide -4 on both sides: -4x/-4 = 5/-4
Simplify: x = -5/4

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3 years ago

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For f(x) = 4x2 + 13x + 10, find all values of a for which f(a) = 7.

sammy [17]

Answer:

0.84

Step-by-step explanation:

4x2+13a+10=7

13a=7-10-8

13a=-11

a=-11:13

a=0.84

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3 years ago