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2 years ago

HELP PLS I NEED TO TURN IT IN MONDAY!

Mathematics

1 answer:

AnnyKZ [126]2 years ago

6 0

Terri can swim 3 laps in 2.5 minutes. To find how long it takes to swim 20 laps, you can make a proportion.

$\frac{Lap}{Time}$

Put the amount of laps on the top and the time(minutes) at the bottom.

$\frac{3}{2.5} = \frac{20}{x}$

Cross multiply:

$20 \times 2.5 = 50$

Divide by 3:

$50 \div 3 = 16 \frac{2}{3} \rightarrow 16.67$

It would take Terri $16 \frac{2}{3}$ OR $16.67$ minutes to run 20 laps.

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What does x equal to in this problem

IgorC [24]

Using the triangle, we can find the angle lengths and using those and trig ratios, find the side lengths. Lets say the top side length is "y".

Using the Law of triangles, we can find the missing angle from 180-90-70=20 deg.

Then we can use the Law of sines,

sin(70)/13=sin(20)/y

y=sin(20)*13/sin(70)

y=15.34

Finally, we use the Pythagorean Theorem, (13)^2+(15.34)^2=x^2

x = 20.1

3 0

2 years ago

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What is the unit value the 3 in 432 ?

lara [203]

Answer:
It represent the tens of the number, therefore, it's unit value is 30

Explanation:
The place value chart is added in the attached image.

Checking this chart, we would find that:
first digit from the right is the units of the number
second digit from the right is the tens of the number
third digit from the right is the hundreds of the number

Comparing this with the nuber given, we would find that the 3 is in the tens position. Therefore, it unit value is 30.

Another way to answer this is by breaking the number given as follows:
432 = 400 + 30 + 2
We can note that the unit value of the 3 is 30

Hope this helps :)

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2 years ago

Is the point (−7,1) a solution to the inequality y<0.5x+9? yes or no

pshichka [43]

(-7,1) is a solution to the inequality y<0.5x+9

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3 years ago

the coordinates of a pentagon ABCDE are A(-5,4),B (1,4),C(1,-1), D(-2,-5) and E(-5,-1) what is the perimeter of the pentagon

kogti [31]

Perimeter is a continuous line forming the boundary of a closed geometrical figure. perimeter of a pentagon = AB+BC+CD+DE+EA (that is 5 sided figure)
so my plan is easy but effective, calculate all those distances using those coordinates with the aid of distance formular. then you add those distances algebraically .

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3 years ago

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Help plz!!!!! will be gratefully appreciated

Morgarella [4.7K]

(A) is your answer

In this case, only rotational symmetry can work, with a turn of 180°

hope this helps

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3 years ago