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mina [271]
3 years ago
13

Perform the indicated operation. (-9 + 21) - (-12 + 4) =

Mathematics
1 answer:
Trava [24]3 years ago
6 0

Answer:

29

Step-by-step explanation:

-9+21= 21

-12+4=-8

21-(-8)=29

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19. Fill in the numbers to find the100
Ratling [72]
Multiply 20 by 5 and you get 100, please tell if this is what you wanted!
8 0
3 years ago
Read 2 more answers
Please help i really need it, i will give brainliest to the right answers
Dmitry_Shevchenko [17]

Answer:

-292 1/2

Step-by-step explanation:

PEMDAS

Perenthesis

2 To the power of 4 = 16 + 1/4 = 16/1 + 1/4 X -18

4 0
2 years ago
Selma spent
Taya2010 [7]

Answer:

30%

Step-by-step explanation:

Selma spent 3/10 of her allowance on a new backpack.

Hence, the percent of her allowance that she spent is calculated as:

Fraction of allowance spent on Backpack × 100

= 3/10 × 100

= 0.3/1 × 100

= 30%

Therefore, Selma spent 30% of her allowance on a new backpack.

8 0
3 years ago
Fairly easy question
nexus9112 [7]

Answer:

C. x=3 and y=−6

Step-by-step explanation:

Step: Solvex−2y=15for x:

x−2y=15

x−2y+2y=15+2y(Add 2y to both sides)

x=2y+15

Step: Substitute2y+15forxin2x+4y=−18:

2x+4y=−18

2(2y+15)+4y=−18

8y+30=−18(Simplify both sides of the equation)

8y+30+−30=−18+−30(Add -30 to both sides)

8y=−48

8y8=−488(Divide both sides by 8)

y=−6

Step: Substitute−6foryinx=2y+15:

x=2y+15

x=(2)(−6)+15

x=3(Simplify both sides of the equation)

Answer:

x=3 and y=−6

7 0
3 years ago
1. The sum of the angles is 90° The difference between twice the larger angle and the smaller
Ostrovityanka [42]

Answer:

\displaystyle 25°\:and\:°65

Step-by-step explanation:

{90° = m∠1 + m∠2

{105° = 2m∠1 - m∠2

_______________

\displaystyle \frac{195°}{3} = \frac{3m∠1}{3} \\ \\ 65° = m∠1

All you have left to do is this:

\displaystyle 25° = -65° + 90°

So, your two angle measures are \displaystyle 25°\:and\:°65.

I am joyous to assist you anytime.

5 0
3 years ago
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