3 years ago

Select the correct answer.

Mathematics

1 answer:

vovangra [49]3 years ago

6 0

Answer:

Step-by-step explanation:

think of the ratios as equivalent fractions. 2 over 14 is NOT equal to 3 over 42.

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X-1/4x^2+7x+3 divided by 2x^2+4x-6/4x^2+11x+6

Zina [86]

You pretty much just flip the second fraction and factor

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2 years ago

Rory earned an 84% on his test. He answered 21 questions correctly. How many total questions were on the

Anna35 [415]

Answer:

21 is 84% to 25, so there would be 25 total questions on the test

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2 years ago

For her exercise today, Keiko plans to both run and swim. Let r be the number of laps she runs and let s be the number of laps s

DerKrebs [107]

Answer:

5r + 3s ≥ 30

Step-by-step explanation:

We know Keiko wants to do exercise at least 30 minutes a day, and she wants ideally to mix up the activities, by combining running and swimming into her schedule.

Since each lap she runs takes 5 minutes and each lap she swims takes 3 minutes, these will be the left side of the inequality:

5r + 3s

She wants to exercise at least 30 minutes a day, so...

5r + 3s ≥ 30

she could do 3 laps of running and 5 laps of swimming for example.

6 0

2 years ago

In ΔАВС, m∠ACB = 90°, <br> CD<br> ⊥ <br> AB<br> m∠ACD = 30°, and AC = 6 cm. Find BD

myrzilka [38]

It is 9 because you have a 30,60,90 triangle, and then you can use pythagorean theorem.

3 0

3 years ago

Read 2 more answers

Two jet planes simultaneously started travelling in opposite directions from the same airport. Four hours later they were 3800 m

alexira [117]

Answer:

Step-by-step explanation:

let the speed of one plane=x

speed of other plane=x+80

time=4 hrs

then 4x+4(x+80)=3800

4x+4x+320=3800

8x=3800-320

or 8x=3480

x=435

speed of one plane=435 m/h

speed of other plane=435+80=515 m/h

Let he walks x hrs

then he take a taxi for 2-x hrs

4x+(2-x)50=31

4x+100-50x=31

-46x=-69

$x=\frac{-69}{-46}=\frac{3}{2}$

so he walks 3/2 hrs=1.5 hrs

travels by taxi=2-1.5=0.5 hrs

distance traveled by taxi=0.5×50=25 miles

8 0

3 years ago