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4 years ago

Do you guys know how to multiply decimals because I can’t I forgot! What’s 87.8 Times 66.4

Mathematics

1 answer:

sveticcg [70]4 years ago

5 0

Multiply like you normally would then add the decimal to the product. In this case it's two decimal places.

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What is the smallest perimeter possible for a rectangle whose area is 16 in2, and what

siniylev [52]

A = 4,

we denote one side of the rectangle with
a
, and the other with
b
we can write, that:
a
⋅
b
=
16

so we can write, that
b
=
16
a
Now we can write perimeter
P
as a function of
a
P
=
2
⋅
(
a
+
16
a
)
We are looking for the smallest perimeter, so we have to calculate derivative:
P
(
a
)
=
2
a
+
32
a
P
'
(
a
)
=
2
+
(
−
32
a
2
)
P
'
(
a
)
=
2
−
32
a
2
=
2
a
2
−
32
a
2
The extreme values can only be found in points where
P
'
(
a
)
=
0
P
'
(
a
)
=
0
⇔
2
a
2
−
32
=
0
2
a
2
−
32
=
0

x
a
2
−
16
=
0

×
x
.
.
a
2
=
16

×
×
x
a
=
−
4
or
a
=
4
Since, length is a scalar quantity, therefore, it cannot be negative,
When
a
=
4
,
b
=
16
4

b
=
4

7 0

3 years ago

The cost of 6 CDs are $12, $13, $20, $20, $12.50 and $18.50. What is the mode?

Snezhnost [94]

Answer:

Mode is 20.

Step-by-step explanation:

Mode is the value or values in the data set that occurs most frequently.

{12, 12.50, 13, 18.50, 20, 20}

20 is the number that occurs most frequently.

hope this helps and is right :)

4 0

3 years ago

PLEASE HELP ASAP I always give brainliests!

nlexa [21]

first to find average age add all the ages divide by number of ages 4

5+4=9

9+6=15

15+39=54

54/4=13.5

For standard deviation find the mean/average

13.5

then subtract the mean from each number/age

5-13.5=-8.5

4-13.5=-9.5

6-13.5=-7.5

39-13.5=25.5

then square each number

-8.5^2=-72.25

-9.5^2=-90.25

-7.5^2=-56.25

25.5^2=650.25

then find the mean/average of the new numbers

-72.25+-90.25+-56.25+650.25=431.5

431.5/4=107.85

then take the square root of the new mean/average

$\sqrt{ 107.875}\\10.38628903...$

7 0

3 years ago

What is the measure of ∠w, rounded to the nearest degree? 19° 19° 32° 32° 56° 56° 71° 71° a horizontally-aligned scalene triangl

ella [17]

Answer:

(d) 71°

Step-by-step explanation:

The desired angle in the given isosceles triangle can be found a couple of ways. The Law of Cosines can be used, or the definition of the sine of an angle can be used.

Since the triangle is isosceles, the bisector of angle W is an altitude of the triangle. The hypotenuse and opposite side with respect to the divided angle are given, so we can use the sine relation.

sin(W/2) = Opposite/Hypotenuse

sin(W/2) = (35/2)/(30) = 7/12

Using the inverse sine function, we find ...

W/2 = arcsin(7/12) ≈ 35.685°

W = 2×36.684° = 71.37°

W ≈ 71°

<h3>Law of cosines</h3>

The law of cosines tells you ...

w² = u² +v² -2uv·cos(W)

Solving for W gives ...

W = arccos((u² +v² -w²)/(2uv))

W = arccos((30² +30² -35²)/(2·30·30)) = arccos(575/1800) ≈ 71.37°

W ≈ 71°

7 0

2 years ago

X+3y=10 i need help

erastova [34]

The correct answer is C).

5 0

3 years ago