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stellarik [79]
3 years ago
9

I need help with 63 64 and 65 please please please help

Mathematics
1 answer:
snow_tiger [21]3 years ago
5 0
#64
Let x represent the time spent for valleyball
Then swimming will be 2x

x + 2x = 4.5
3x = 4.5
x = 4.5/3
x = 1.5

Time spent on valleyball: 1 1/2 hours
Time spent on swimming: 3 hours
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The diameter of a semicircle is 6 miles. What is the semicircle's perimeter?
koban [17]

Answer:

15.42mi

Step-by-step explanation:

Use the formula for a semicircle's perimeter.

P=\frac{1}{2}\pi *d+d

Plug in 6 for d.

P=\frac{1}{2}\pi*6+6

Let's use 3.14 for \pi, just to make it easier, but of course, if it states to round it to something else, just plug in that many values for \pi.

P=\frac{1}{2}(3.14)*6+6 \\ \\ P=1.57*6+6 \\ \\ P=9.42+6 \\ \\ P=15.42

5 0
3 years ago
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9(a+2)=9 <br> con comprobación plisss!!
icang [17]

Answer:

9a+18=9

9a=-9

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Step-by-step explanation:

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3 years ago
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agasfer [191]

Answer:

10.8 Cm

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3 0
3 years ago
What is an equation of a line,in point-slope from, that passes through (1, -7) and has a slope of -2/3
il63 [147K]

Answer:

y + 7 = - \frac{2}{3}(x - 1)

Step-by-step explanation:

The equation of a line in point- slope form is

y - b = m(x - a)

Where m is the slope and (a, b) a point on the line

Here m = - \frac{2}{3} and (a, b) = (1, - 7), thus

y - (- 7) = - \frac{2}{3}(x - 1), that is

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3 0
3 years ago
PLZ HURRY
alina1380 [7]

Answer:

One

Step-by-step explanation:

x+4y = 6

if why is 2x-3 plug it in

x+4(2x-3) = 6

simplify it and you get

x=2

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3 years ago
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