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3 years ago

Does anyone know any good revision websites

Mathematics

2 answers:

lana [24]3 years ago

8 0

Answer:

studywise is where you can find some good websites

kirill [66]3 years ago

5 0

Answer: Grammarly

Step-by-step explanation: I use it, it is very nice and useful. You can copy/paste your articles into their editor and they will correct it for you. It's free, too -- unless you want Premium, that is. It corrects grammar, spelling, clarity and more. I definitely recommend it.

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The sum of a positive number and 56 times its reciprocal is equal to its cube. What is the number?

cricket20 [7]

Answer:

2×sqrt(2) = 2.828427125...

Step-by-step explanation:

x = "a positive number"

x + 56/x = x³

x² + 56 = x⁴

x⁴ - x² - 56 = 0

(x² + 7)(x² - 8) = 0

this is true only for

x² = -7

x² = 8

x² = -7 would mean that x is an imaginary number. so, that is not a valid solution here.

x² = 8 means

x = sqrt(8) = sqrt(4×2) = 2×sqrt(2) = 2.828427125...

7 0

2 years ago

Please help me please i really need help please

egoroff_w [7]

Answer:

Step-by-step explanation:

3 0

3 years ago

When fritz drives to work his trip takes 40 minutes, but when he takes the train it takes 30 minutes. find the distance fritz t

sweet-ann [11.9K]

Distance = rate*time

convert minutes to hour first because the question talking about 15 mile per hour
40 mins = 40/60 2/3 hrs
30 mins = 30/60 = 1/2hrs

Assume that s be the speed when Fritz driving, so
s + 15 will be the speed of the train.

We know the time we know the speed, Next
distance that Fritz drive = $\frac{2}{3}s$
distance the train travel = $\frac{1}{2}(s+15)$

The question: Assume that the train travels the same distance as the car
==> $\frac{2}{3}s = \frac{1}{2}(s+15)$
==> $\frac{2}{3}s = \frac{1}{2}s + \frac{15}{2}$
==> $\frac{2}{3}s - \frac{1}{2}s = \frac{15}{2}$
==> $\frac{1}{6}s = \frac{15}{2}$
==> $\frac{6}{1} * \frac{1}{6}s = \frac{15}{2} * \frac{6}{1}$
==> $s = 45$
Now we know that Fritz drive at 45 mph,
distance = $\frac{2}{3} * 45 = 30 miles$

3 0

4 years ago

Check For Understanding

adelina 88 [10]

Answer:

Distance between A ----> B : 2 cm

B ---> C: 3 cm : 600 meters

A----> C: 4 cm

3:600 meters scaled

So its 200 meters per every 1 cm!

From A to B : 400 meters

From B to C : 600 meters

Frok C to A: 800 meters

Therefore we sum 400+600+800= 1800 meters

8 0

3 years ago

Mary are one of the muffins she baked and had 12 left. Write an equation to find how many muffins Mary started with.

Pavel [41]

She started with 13
x=12+1

6 0

3 years ago