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2 years ago

Can somebody help me with this please!!

Mathematics

1 answer:

inn [45]2 years ago

8 0

They are all correct. You have all of the correct symbols and numbers correctly.

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I need help explaining, this homeschool work so hard!!

lapo4ka [179]

Answer:

Step-by-step explanation:

(7 + 5) + 4 * 13 - 2

~Simplify using PEMDAS

12 + 4 * 13 - 2

12 + 52 - 3

64 - 3

Best of Luck~

4 0

3 years ago

If the 7th of an AP is equal to 11 times the 11th term, find the 18th term

Zina [86]

Answer:

-33 or 33

Step-by-step explanation:

The seventh term of an AP is written as:

$a + 6d$

The eleventh term of an AP is written as:

$a + 10d$

If the 7th term is 11 times the 11th term, then;

$a + 6d = 11(a + 10d)$

Expand to get:

$a + 6d = 11a + 110d$

$11a - a = 6d - 110d$

$10a = - 104d$

$\frac{a}{d} = - \frac{104}{10}$

$\frac{a}{d} = - \frac{52}{5}$

We must have a=-52 and d=5

a=52 and d=-5

For the first case, the 18th term is :

$- 52 + 5 \times 17 = 33$

For the second case,

$52 - 5 \times17 = - 33$

3 0

4 years ago

For the following system of equations what is the x - value of the solution. -x+2y=6 6y=x+18

Stella [2.4K]

Answer:

For the system of equations given, x = 0

Step-by-step explanation:

1. Let's solve the system of equations to find out the value of x:

1st equation:

x+ 2y = 6

x = 6 - 2y (Subtracting 2y at both sides)

2nd equation:

6y = x + 18

Replacing x with the result of the 1st equation:

6y = (6 - 2y) + 18

6y = 6 - 2y + 18

6y + 2y = 18 + 6 (Adding 2y at both sides)

8y = 24

y = 24/8 = 3 (Dividing by 8 at both sides)

Now we can find out the value of x:

x + 2y = 6

x + 2 * 3 = 6

x = 6 - 6 (Subtracting 6 at both sides)

x = 0

3. Let's prove that x = 0 and y = 3 in the 2nd equation:

6y = x + 18

6 * 3 = 0 + 18

18 = 18

We proved that x = 0 and y = 3 are correct.

6 0

3 years ago

Read 2 more answers

Two planes, which are 3400 miles apart, fly toward each other. Their speeds differ by 80mph. If they pass each other in 5 hours,

Andreas93 [3]

Answer : The speed of both planes is 61.25 mph and 18.75 mph respectively.

Explanation:

Let the speed of first plane be x mph

Let the speed of second plane be y mph

Since we have given that difference of speeds is 80 mph

i.e. x - y= 80 ( $Eq^n$ 1)

Distance between two planes = 3400 miles

As they are flying towards each other i.e. they are in the opposite direction.

So, Relative speed will be the sum of their speeds i.e.

Relative speed = x + y

And we know speed = $\frac{Distance}{Time}$

Speed= $\frac{3400}{80}$

⇒ Speed = 42.5 mph

Hence, Relative speed becomes 42.5 mph

⇒ x+y=42.5 ( $Eq^n$ 2)

Now, by using the elimination method of solving the system of equation, we have ,

x= 61.25 mph

and y = 18.75 mph

4 0

3 years ago

Solve −3=8x−4y for y

vovikov84 [41]

Answer:

The answer is:

Y = 3/4+2x

3 0

3 years ago

Read 2 more answers