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3 years ago

What is the error in both of these problemexpain how you got your answer

Mathematics

1 answer:

RSB [31]3 years ago

8 0

Answer:

Step-by-step explanation:

Step where it was wrong ->

x-8 = 0

x=-8

They just put negative eight on the right side you have to cancel negative 8 out by adding negative 8 on both sides.

x-8=0

+8 +8

x=8 <- Right solution.

Step where it was wrong ->

8(p-7) = 75

8p-7=75

Distributive Property you have to do 8 times p and 8 times -7, they just did 8 times p and forgot to do 8 times -7.

8(p-7)=75

8p-56=75 <- Do 8 * -7 in addition of doing 8 *p

8p=131

/8 /8

p = 16.735 or 131/8

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The greatest comen factor of 21, 30,49

liq [111]

The greatest common factor for 21 is 7
For 30 is 15
49 is 7

I’m no totally sure but i think that is right

4 0

3 years ago

10. MJ and Peter Parker leave school traveling in opposite

Paladinen [302]

Using proportions, it is found that:

Peter is walking at a rate of 3 km/h.
MJ is biking at a rate of 9 km/h.

---------------------------

Peter is walking at a rate of x km/h.
MJ is biking 6 km/h faster than Peter, thus 6 + x km/h.
Opposite directions, thus, their distance increases at a rate of (6 + 2x) km each hour, as $6 + x + x = 6 + 2x$ .

6 + 2x km each hour, 18 km after 1.5 hours, thus, the rule of three is:

1h - (6 + 2x) km

1.5h - 18 km

Applying cross multiplication:

$1.5(6 + 2x) = 18$

$9 + 3x = 18$

$3x = 9$

$x = \frac{9}{3}$

$x = 3$

$x + 6 = 3 + 6 = 9$

Then:

Peter is walking at a rate of 3 km/h.
MJ is biking at a rate of 9 km/h.

A similar problem is given at brainly.com/question/24112433

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2 years ago

If<br> a = 60°<br> What does B and C equal to?

Orlov [11]

Answer:

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2 years ago

find the coordinate of U' after a 90° counterclockwise rotation of the triangle about the origin and then a translation of 2 uni

SVETLANKA909090 [29]

Answer: U' = (0, 1)

<u>Step-by-step explanation:</u>

U = (3, -5)

rotate 90° counterclockwise means (x, y) = (-y, x)

new U = (5, 3)

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6 0

2 years ago

Let k ( x ) = 2 x + 3 and m ( x ) = 3 x 2 + 7 x − 10 . Find the indicated value. M ( k ( − 4 ) ) =

murzikaleks [220]

Answer: $30$

Step-by-step explanation:

Given

$k(x)=2x+3$

$M(x)=3x^2+7x-10$

$M\left(k(x)\right)$ is given by replacing the $x$ by $k(x)$ from the $M(x)$

$\Rightarrow M\left(k(x)\right)=3(2x+3)^2+7(2x+3)-10\\\Rightarrow M\left(k(x)\right)=3(4x^2+9+12x)+14x+21-10\\\Rightarrow M\left(k(x)\right)=12x^2+50x+38$

Now, $M\left(k(-4)\right)$ is

$\Rightarrow M\left(k(-4)\right)=12(-4)^2+50(-4)+38\\\Rightarrow M\left(k(-4)\right)=192-200+38\\\Rightarrow M\left(k(-4)\right)=30$

8 0

3 years ago

What is the error in both of these problemexpain how you got your answer​

What is the error in both of these problemexpain how you got your answer