3 years ago

(3x + 5y +1) + (5x + y-2)=?

Mathematics

1 answer:

mamaluj [8]3 years ago

8 0

Answer:

8x+6y+(-1)

Step-by-step explanation:

3x+5x=8x 5y+y=6y 1-2=(-1) Add it all together

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A rectangular brick has a length of 5 centimeters, a width of 9 centimeters and a height of 20 centimeters.What is the surface a

a_sh-v [17]

ANSWER
The surface area of the brick is;

$650 \: {cm}^{2}$

EXPLANATION

The dimensions of the rectangular brick are

$l = 5cm$
$w = 9cm$
$h = 20cm$

The total surface area of a rectangular brick is given by,

$T.S.A = 2(lw + lh + hw)$

We substitute the values into the formula to obtain,

$T.S.A = 2(5 \times 9 + 5 \times 20 + 9 \times 20)$

$T.S.A = 2(45+ 100+ 180)$

$T.S.A = 2(325)$

$T.S.A =650 \: {cm}^{2}$

6 0

3 years ago

What is the value of the expression shown below?

stiv31 [10]

6 +(9 -1)²/4×(1/2)⁴
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= 6 +1
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4 0

4 years ago

7m - 3m-6 < 6 help pls

fenix001 [56]

Answer:

m < 3

Step-by-step explanation:

7m-3m - 6 < 6

4m < 6 + 6

4m < 12

4m ÷ 4 < 12 ÷ 4

m < 3

6 0

3 years ago

The length of a rectangle is 5 inches more than 3 times the width. If the area of the rectangle is 68 square inches, what is the

Paladinen [302]

Answer:

Width=4, and Length=17

Step-by-step explanation:

first you will make a variable for the width which i will say is x

now make it an equation (3x+5) (x) = 68

then solve 3x^2+5x=68

then 3x^2+5x-68=0

then x=4

then you have to substitute so 3(4)+5= 17 and 4

6 0

3 years ago

This has to do with mean,median,mode, and all that stuff, but my teacher is like,not really good at explaining stuff lol

Flura [38]

The average of 6 quiz scores, where $x$ is the score of the last quiz, is

$\dfrac{83+81+89+92+80+x}6=\dfrac{425+x}6$

The student needs a minimum average of 86 to earn an A:

$\dfrac{425+x}6=86\implies425+x=516\implies x=91$

so the student needs a score of 91.

5 0

3 years ago

(3x + 5y +1) + (5x + y-2)=?​

(3x + 5y +1) + (5x + y-2)=?