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3 years ago

13

sela put 6 times as many coins now as she had 4 months ago. if sela has 240 coins now, how many did she have 4 months ago

2 answers:

scoray [572]3 years ago

6 0

She put 24 coins 4 months ago because 6 times 4 is 24.

yuradex [85]3 years ago

5 0

Sela had 40 coins 4 months ago because 240 divided by six is 40.

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Assume that the readings on the thermometers are normally distributed with a mean of 0 C and a standard deviation of 1 C. A ther

mel-nik [20]

Answer: -2.12°C

Step-by-step explanation:

Let x denotes the reading of the thermometers .

We assume that the readings on the thermometers are normally distributed.

Let a be the reading that separates the rejected thermometers from the others.

Given: Population mean : $\mu=0$

Standard deviation: $\sigma= 1$

Also, $P(x$

By using the z-table , the z-value corresponds to the p-value (one -tailed)0.017 is $\pm2.12$ .

Now, $z=\dfrac{a-\mu}{\sigma}$

i.e. $\pm2.12=\dfrac{a-0}{1}$

i.e. $\pm2.12=a$

For left tailed , $a=-2.12$

It means the reading that separates the rejected thermometers from the others = -2.12°C.

5 0

3 years ago

SERIOUSLY NEED HELP QUICK! The table shows the total cost for different numbers of jackets.

Tema [17]

The cost of 3 jackets would be $69.75.

8 0

4 years ago

Read 2 more answers

Can someone please help me?<br> I will give brainliest

Mice21 [21]

We can find the QS side that is missing by using the proportions (C) QS/SR = PO/OR.

<h3>What do we mean by proportions?</h3>

A proportion is an equation that equalizes two ratios.
You could, for instance, write the ratio as follows: 1: 3 in the case of 1 boy and 3 girls (for every one boy there are 3 girls)
The proportion formula is used to determine whether two ratios or fractions are equal.
We can find the missing value by dividing the given values.
The proportion formula can also be written as a: B::C:D = a/b = c/d, where a and d are the extreme terms and b and c are the mean terms.

So, a proportion that is used to determine the QS's missing side

(A) QS/OR = PO/SR

Not possible, and the bases in the denominator have the wrong base positions.

(B) PR/PO = QS/QR

Not possible because the order of the lines does not allow for the measurement of line length. QS/SR = PO/OR.

(C) QS/SR = PO/OR

Given that the sides and base are both perfectly positioned within the fractions, this ratio can be used to determine the length of line QS.

Therefore, we can find the QS side that is missing by using the proportions (C) QS/SR = PO/OR.

Know more about proportions here:

brainly.com/question/19994681

#SPJ13

6 0

2 years ago

5+ x =47;x=52<br><br><br> HELP ME !!!

rusak2 [61]

So 5+x=47
subtract 5 from both sides
x=42
not 52
the answer is 42

3 0

3 years ago

The floor of the entryway to an office building will be triangular. Two angles of the triangle will measure 40º, and the side be

ruslelena [56]

Answer:

The drawing in the attached figure

Step-by-step explanation:

we know that

An isosceles triangle, has two equal sides and two equal interior angles

In this problem, the floor of the entryway to an office building is in the shape of an isosceles triangle

step 1

Find the measure of the vertex angle

Remember that

The sum of the interior angles in any triangle must be equal to 180 degrees

so

Let

x ---> the measure of the vertex angle of triangle

$x=180^o-2(40^o)=100^o$

step 2

Find the length of the congruent sides of triangle

Applying the law of sines

Let

c ----> the length of one congruent side

$\frac{a}{Sin(A)}=\frac{b}{Sin(B)}$

we have

$a=8\ m\\A=100^o\\B=40^o$

substitute

$\frac{8}{Sin(100^o)}=\frac{b}{Sin(40^o)}$

solve for b

$b=\frac{8}{Sin(100^o)}(Sin(40^o))$

$b=5.22\ m$

step 2

Make a scale drawing of the entryway

The scale drawing is 1 cm : 2 cm

That means

1 cm in the drawing represent 2 cm in the actual

or

1 cm in the drawing represent 0.02 m in the actual

Find the dimensions in the drawing

For a=8 m

$8\ m=8/0.02=400\ cm$

For b=5.22 m

$5.22\ m=5.22/0.02=261\ cm$

step 3

Draw the triangle

see the attached figure

3 0

3 years ago