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4 years ago

Which expressions are equivalent to -9x-21

Mathematics

1 answer:

MAVERICK [17]4 years ago

3 0

Answer:

-3(3x+7)

Step-by-step explanation:

turn it into distributive property

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If 2x+y=8 and x-y=1 then y=?

lesantik [10]

Hope this helps you.::

4 0

4 years ago

The ratio of red to yellow paint is 4:3. If you use 24 pints of yellow paint, how many pints of red paint do you need?

Leokris [45]

Answer:

32 pints

Step-by-step explanation:

Given :-

The ratio of red to yellow is 4:3 .
I use 24 pints of yellow paint .

And we need to find how many pints of red paint will we use .So let us take that we used x pints.

According to the Question :-

$:\implies$ 4:3 = x : 24

$:\implies$ 4/3 = x/24

$:\implies$ 4 = x/8

$:\implies$ x = 8*4

$:\implies$ x = 32

Hence we will use 32 pints of red paint.

6 0

3 years ago

Read 2 more answers

Find the surface area of the prism.

Brrunno [24]

Answer:

108 cm²

Step-by-step explanation:

the surface area is the sum of all individual shapes areas on the surface.

2 right-angled triangles

3 rectangles

area of a right-angled triangle is At = a×b/2

At = 4×3/2 = 6 cm²

we need it twice : 12 cm²

one rectangle (length×width) = 8×3 = 24 cm²

one rectangle = 8×4 = 32 in²

one rectangle = 8×5 = 40 cm²

total surface area

A = 12+24+32+40 = 108 cm²

an area is always a square unit (power of 2).

a volume is always a cubic unit (power of 3).

and a length is always a simple unit (power of 1).

6 0

3 years ago

The sum of the digits of a two-digit number is 11. The number obtained by interchanging the digits exceeds twice the original nu

Mumz [18]

Cool problem

x and y are the digits
x+y=11
yx=2(xy)+34
I'm not sure how to solve this using legit math so use trial and error

the 1 digit numbers that could be possible are
9,2
8,3
7,4
6,5
5,6
4,7
3,8
2,9
all of them add up to 11

the pairs obtained by swiching the number are
92 and 29
83 and 38
74 and 47
65 and 56

we find which ones are equal when we subtract 34 from the larger number and divide by 2
92-34=58
58/2=29
92 and 29 work

83-34=49
49/2=24.5 not equal to 38 not work

74-34=40
40/2=20 47 not equal to 20 so doesn't work

65-34=31
31/2=15.5 not equal to 56 so doesn't work

the origonal number is 29

4 0

4 years ago

The leg of a right triangle are 3 units and 10 units. What is the length of the hypotenuse? Round your answer to the nearest hun

Andreas93 [3]

Hey there! This is gonna require the Pythagorean Theorem which is a^2 + b^2 = c^2

a and b in this case are the legs while c is the hypotenuse! So, we can just plug in the numbers we know!

3^2 + 10^2 = c^2

9 + 100 = c^2

109 = c^2

And then take the square root of 109 to get the hypotenuse.

10.4403065089 = c

Since we need to round to the nearest hundredth, though, it would be 10.44

I hope that helps! Feel free to let me know if you have any questions!

- mathwizzard3

6 0

3 years ago