All categories

3 years ago

Jan’s age is 3 years less than twice Tritt’s age. The sum of their ages is 30. Find their ages.

Mathematics

1 answer:

pishuonlain [190]3 years ago

6 0

Answer:

Tritt Is 27

Step-by-step explanation:

Because if u subtract 30-3=27

You might be interested in

PLEASE HELP ASAP!

vazorg [7]

Answer:

A. $\displaystyle \frac{6}{10}$

Step-by-step explanation:

$\displaystyle \frac{9}{15} = \frac{6}{10}$

Greatest Common Divisor [GCD]: 1½

I am joyous to assist you anytime.

4 0

4 years ago

Lily swims for 5 hours in stream that has a current of 1 mph. She leaves her dock, swims upstream for 2 miles and then swim back

antiseptic1488 [7]

Answer:

Swimming speed in still water is approximately 1.5 mph

Step-by-step explanation:

Given the speed of the current = 1 mph

distance she swims upstream =2 miles,

the total time = 5 hours.

She swam 2 miles upstream against the current and 2 miles back to the dock with the current. The formula that relates distance, time, and rate is $d = r t\ \ \ \ or \ \ \ t= \frac{d}{r}$

Let x be the speed in still water.

Then her speed with the current is x + 1, and

her speed against the current is x – 1.

Total time is equal to 2 miles with upstream and 2 miles downstream.

$\frac{2}{x+1}+\frac{2}{x-1}=5\\\\\frac{2(x-1)}{(x+1)(x-1)}+\frac{2(x+1)}{(x-1)(x+1)}=5\\\\\frac{2x-2}{(x^2-1)}+\frac{2x+2)}{(x^2-1)}=5\\\\\frac{2x-2+2x+2)}{(x^2-1)}=5\\\\4x=5(x^2-1)\\4x= 5x^2-5\\0= 5x^2-4x-5$

Now Using quadratic formula to solve above equation we get;

$x= \frac{-b \±\sqrt{b^2-4ac}} {2a}\\\\here \ \ a= 5,b=-4,c=-5\\\\x= \frac{-(-4) \±\sqrt{(-4)^2-4\times 5\times-5}} {2\times5}\\\\x=\frac{4 \±\sqrt{16+100}} {10}\\\\x=\frac{4 \±\sqrt{116}} {10}=x=\frac{4 \±2\sqrt{29}} {10}= x=\frac{2 \±\sqrt{29}} {5}\\ x \approx 1.5 \ or \ x = -0.7$

Since speed must be positive, Hence speed of still water is about 1.5 miles per hour.

3 0

3 years ago

How long does it take for the ball to hit the ground (in seconds) rounded to the nearest hundredth

Fofino [41]

Answer:

I need some numbers to do this problem

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Two-variable linear equations 2x – 5y = 20

Lynna [10]

Y= (2x-20)/ 5 then you replace y so with a simple calculation u get x than u replace x with it value to get y as simple as that

7 0

3 years ago

Prove that 1/1+sinA -1/1+sinA =2tanAsinA

enyata [817]

Step-by-step explanation:

$\frac{1}{1 + \sin( \alpha ) } \frac{1}{1 - \sin( \alpha ) } \\ \frac{1 - \sin( \alpha ) + 1 + \sin( \alpha ) }{(1 + \sin( \alpha ))(1 - \sin( \alpha )) } \\ = \frac{2}{1 - {sin}^{2} \alpha } \\ \frac{2}{ {cos}^{2} \alpha } = 2 \: {sec}^{2} \alpha$

3 0

3 years ago