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julsineya [31]
3 years ago
7

I'm not sure at all how to do this​

Mathematics
1 answer:
Greeley [361]3 years ago
6 0

Answer:

Step-by-step explanation:

Cos(Ф) = Adj / Hyp

Cos(Ф) = Adj / 5

use Pythagoras's  

5^{2} =  2^{2} +x^{2}

25 - 4 = x^{2}

21 = x^{2}

\sqrt{21} = x

Cos(Ф) = \sqrt{21} / 5      

(using the square root means the answer is exact. so leave it like that.)

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the diagram shows the width of a rectangle 1/3 cm and is area 1/5 cm square. find the length of the rectangle
Anna35 [415]
Area= length(width)
1/5=1/3(length)
Length= 1/5(3/1) or 1/5 divided by 1/3
Length= 3/5 cm
Therefore, the length of the rectangle is 3/5 cm.
Hope this helps!
8 0
3 years ago
Trying to find the missing segment to the triangle in the attached image.
KIM [24]

Answer:

36 units.

Step-by-step explanation:

we will use concept of basic proportionality theorem,

it states that , when a line is drawn parallel to one side of the triangle and intersect the other two sides then the two sides are divided in the same ratio.

Example:

In a triangle ABC

If  DE is  parallel to BC

D is a point on line AB and E is  point on AC, then

by basic proportionality theorem)

AD/DB = AE/EC

_____________________________________

in the problem  given one side has a parallel line drawn to it

Hence we can use basic proportionality theorem in it

20/30 = 24/?

2/3 = 24/?

=> ? = 24*3/2 = 36

Hence, missing segment value is 36 units.

8 0
3 years ago
2(5v+3) - 4(7v+1) = -88 Show all work
Novosadov [1.4K]

Answer:

5

Step-by-step explanation:

● 2(5v+3) - 4(7v+1) = -88

● 10v + 6 - 28v - 4 = -88

● (6-4) + (10v-28v) = -88

● 2 + -18 v = -88

● -18v = -90

● v = 90/18

● v = 5

5 0
3 years ago
Vicky charged her phone to 100 percent, it loses 5 percent of its battery life every hour. What function models the percentage o
zlopas [31]

Answer:

f(x)=100-5h

Step-by-step explanation:

Let's say that the variable h is the number of hours.

f(x)=100-5h

f(x)=100 percent minus 5 percent per hour.

6 0
3 years ago
Read 2 more answers
A car travels 117 miles at the speed of 36 miles per hour. Find the time taken for the journey using the formula d = rt.
g100num [7]
117 divided by 36 = 3.25

So it is 3.25 hours?
4 0
2 years ago
Read 2 more answers
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