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zaharov [31]
3 years ago
6

A bag contains purple marbles and white marbles, 68 in total. The number of purple marbles is 4 less than 5 times the number of

white marbles. How many purple marbles are there?
Mathematics
1 answer:
galina1969 [7]3 years ago
3 0

Answer: 56 purple marbles.

Step-by-step explanation:

Let be "p" the number of purple marbles in the bag and "w" the number of white marbles in the bag.

You can set up the following System of equations:

\left \{ {{p+w=68} \atop {p=5w-4}} \right.

You can use the Substitution method to solve the System of equations. The steps are shown below:

1. You need to substitute the second equation into the first equation:

(5w-4)+w=68

2. Now you must solve for "w":

5w-4+w=68\\\\6w-4=68\\\\6w=68+4\\\\6w=72\\\\w=\frac{72}{6}\\\\w=12

3. Substitute the value of "w" into second original equation and then evaluate in order to find the value "p":

p=5(12)-4\\\\p=60-4\\\\p=56

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Find the mid point of PQ if P (0,0) and Q (5, 12)
Simora [160]
Using the midpoint formula we get:

(x,y)=(0+5/2, 0+12/2) or (5/2, 6) as the midpoint.
5 0
3 years ago
2b-3(1+b)=-3(b+7) whats the answer? and how do you do it??
ycow [4]

Answer:

B=-9

Step-by-step explanation:

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7 0
2 years ago
Read 2 more answers
Ill give brainlist if someone can help me with this question
inna [77]

Answer:

m = 1 and b = 5/7

Step-by-step explanation:

Take two of the points. The first two. (7, 5) and (8, 6).

We can find the slope using:

y2-y1/x2-x1

We can sub in the values:

6-5/8-7 = 1/1 = 1

So the slope is 1

now, putting this into y=mx+b, and using one of the coordinates from earlier, we can solve for b:

5 = (1)(7) + b

b = 5/7

Therefore, m = 1 and b = 5/7

Hope this helps!

3 0
3 years ago
A projectile is fired at time t = 0.0 s, from point 0 at the edge of a cliff, with initial velocity components of V ax= 50m/s an
Kruka [31]

The projectile has constant horizontal speed all the time and we can use this formula

x=Vax*t, where t is time it (projectile) takes to reach x=1000m

t=x/Vax=1000/50=20s

As we know we can split projectile trajectory in two parts and the time for each part is equal. We can conclude that time t=20s belong to first part where projectile is going up.

Formula for this type of movement is  y=Vay-(gt∧2)/2

If we take acceleration of gravity g=10m/s∧2

we get     y=200*20-(10*20∧2)/2=4000-2000=2000m

But if I calculate time it takes the highest point I get  

t=Vay/g=200/10=20s

The highest point for that time is

y= H=Vay∧2/2g=200∧2/2*10=40000/20=2000m

This happened because the projecile is fired from the edge of a cliff which is above the sea line.

Good luck!!!

5 0
3 years ago
The areas of the squares adjacent to two sides of a right triangle are shown below
Dahasolnce [82]

Answer:

The area of the square is 85 units^2

Step-by-step explanation:

Okay, here in this question, we are interested in calculating the area of the unknown square.

Kindly note that, since each of the other shapes are squares too, it means that the length of their sides is simply the square root of their areas.

Thus, the length of the squares are ;

√35 units and √50 units respectively

Now to find the area of the larger square, we employ the use of Pythagoras’ theorem which states that the square of the hypotenuse is equal to the sum of the squares of the two other sides

Let’s call the unknown length X

x^2 = (√35)^2 + (√50)^2

x^2 = 35 + 50

x^2 = 85

x = √85 units

Now as we know that the area of a square is simply the length of the side squared,

The area of the biggest square is simply (√85)^2 = 85 units^2

8 0
4 years ago
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