Ask question

Ask question

All categories

3 years ago

12

What is the solution? 21=42−3r r=−8 r=−7 r = 7 r = 8

2 answers:

Crank3 years ago

8 0

21=42−3r

The Answer is r = 7

:P

faltersainse [42]3 years ago

7 0

R=-7, you have to put each answer in the equation, therefore; 21=42-3(-7) So you have to do multiplication (PEMDAS, if you arent aware of that acronym then it stands for the order of what to do with an equation, Parentheses get solved first, then Exponents, then multiplication, then division, then addition, then finally subtraction. Solving in that order will solve your answer correctly.) With -3 times -7 which gives you 21. Then you do 42 - 21 which equals 21. So 21 = 21.

You might be interested in

The order pairs (15,12) means that ? Pounds of beans cost $ ?

irinina [24]

Answer:

it means 15 pounds of beans cost 12 dollars.

Step-by-step explanation:

it means 15 pounds of beans cost 12 dollars.

3 0

3 years ago

WILL GIVE BRAINLIEST!!!!!! Look at the picture of a scaffold used to support construction workers. The height of the scaffold ca

maksim [4K]

Answer:

A). PR = 16.13 ft

B). QR = 9.64 ft

Step-by-step explanation:

Part (A).

From the figure attached,

ΔPQR is a right triangle,

m(PQ) = 14 ft

m(QR) = 8 ft

By applying Pythagoras theorem,

Hypotenuse² = (Leg 1)² + (Leg 2)²

(PR)² = (PQ)² + (QR)²

(PR)² = (14)² + (8)²

PR = √260

= 16.125

≈ 16.13 ft

Part (B).

If PR = 17 feet

and PQ = 14 feet

By applying Pythagoras theorem in ΔPQR,

PR² = PQ² + QR²

(17)² = (14)² + (QR)²

(QR)² = 289 - 196

QR = √93

= 9.644

≈ 9.64 ft

4 0

3 years ago

A right rectangular prism has a length of 8 cm, a width of 3 cm, and a height of 5 cm. What is the surface area of the prism? En

Gennadij [26K]

The surface area is the sum of the area of the six sides...

A=2(xy+xz+yz)

A=2(8*3+8*5+3*5)

A=2(24+40+15)

A=2(79)

A=158 cm^2

6 0

3 years ago

Using synthetic division, find (2x4 + 4x3 + 2x2 + 8x + 8) ÷ (x + 2).

creativ13 [48]

The answer is 32x+8
————
x+2

5 0

4 years ago

Find the coordinates of the point which divides the join of (-1,7) and (4.-3) in the ratio 2:3 ??

d1i1m1o1n [39]

<h2><u>Q</u><u>u</u><u>e</u><u>s</u><u>t</u><u>i</u><u>o</u><u>n</u><u>:</u><u>-</u></h2>

Find the coordinates of the point which divides the join of (-1,7) and (4,-3) in the ratio 2:3 ?

<h2><u>Solution</u>:-</h2>

Let the given points be A(-1,7) and B(4,-3)

Now,

Let the point be P(x, y) which divides AB in the ratio 2:3

Here,

<h3> ${ \bf x \: = \frac{m_1 x_2 \: + \: m_1 x_1}{m_1 \: + \: m_2}}$ </h3>

Where,

$m_1$ = 2 , $m_2$ = 3

$x_1$ = -1 , $x_2$ = 4

$\therefore$ Putting values we get,

x = $\frac{2 \: × \: 4 \: + \: 3 \: × \: -1}{2 \: + \: 3}$

x = $\frac{8 \: - \: 3}{5}$

x = $\frac{5}{5}$

x = 1

Now,

Finding y

<h3> ${ \bf y \: = \frac{m_1 y_2 \: + \: m_2 y_1}{m_1 \: + \: m_2}}$ </h3>

Where,

$m_1$ = 2 , $m_2$ = 3

$x_1$ = 7 , $x_2$ = -3

$\therefore$ Putting values we get,

y = $\frac{2 \: × \: -3 \: + \: 3 \: × \: 7}{2 \: + \: 3}$

y = $\frac{-6 \: + \: 21}{5}$

y = $\frac{15}{5}$

y = 3

Hence x = 1, y = 3

So, the required point is P(x, y)

= P(1, 3)

<h3>The coordinates of the point is P(1, 3). [Answer]</h3>

_______________________________________

<u>N</u><u>o</u><u>t</u><u>e</u>:- Refer the attachment.

_______________________________________

5 0

3 years ago