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Vera_Pavlovna [14]
3 years ago
8

Wilma can mow a lawn in 120 minutes. Rocky can mow the same lawn in 80 minutes. How long does it take for both Wilma and Rocky t

o mow the lawn if they are working together?
Mathematics
1 answer:
saw5 [17]3 years ago
8 0
Work in the rates  / minute 
wilma:-  in 120 minutes she mows 1 lawn
             so in 1 minute she mows 1/120 lawn

similarly, Rock mows 1/80 lawn in 1 minute

working together  1/120 + 1/80  = 1/x  where x is number of minutes working together

1/20 + 1/80 =  1/48  

so 1/x = 1/48

x = 48

answer is 48 minutes
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mitosis

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Step-by-step explanation:

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6 0
3 years ago
Verify the identity. (cos x/ 1+ sin x) + (1+ sin x/cos x) = 2 sec x​
Gekata [30.6K]

Answer:

LHS

\frac{cos x}{1+ sin x} + \frac{1+ sin x}{cos x} \\=\frac{cos2(x)+1+2sin(x)+sin2(x)}{cos(x)(1+sin(x)} \\= \frac{2+2sin(x)}{cos(x)(1+sin(x))} \\\\=\frac{2 (1 + sin(x))}{cos(x)(1+sin(x))} \\= \frac{2}{cos (x)} \\= 2 sec x

= RHS PROVED

hope it helps :)

8 0
2 years ago
How to do division with big number and ,
azamat
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4 0
3 years ago
PLEASE HELP OMG IM ON MY FINAL!!! If z varies inversely as w, and z=4 when w=9, find z when w=12
Drupady [299]

z=3. If z varies inversely as w, and z=4 when w=9, then when w=12 the value of z is 3.

The key to solve this problem is using reverse proportionality, in which two magnitudes a and b are inversely proportional when there is a constant k such that

a⋅b=k, where constant k is called the proportionality constant.

Then if z varies inversely as w, and z=4 when w=9

z.w=k -------> 4.9=k -------> k=36

So, let's find z when w = 12. With k = 36

z.w=K, clear z from the equation

z=k/w -------> z=36/12 -----> z=3

4 0
3 years ago
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