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Yanka [14]
3 years ago
9

Somebody help me with this 30 points ☺️

Mathematics
1 answer:
brilliants [131]3 years ago
8 0

Answer:

4r- 21

Step-by-step explanation:

4 - r= r and r+ 21/= R21 and Simplified Is -4 and R21

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Vera_Pavlovna [14]
Make them both improper fractions.
77/10 - 19/5

Give them common denominators (multiply the second fraction by 2)
77/10 - 38/10

Subtract 
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8 0
3 years ago
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A student is making cookies for a bake sale. He sells 8 snickerdoodles and 12 chocolate chip
lions [1.4K]

Answer:

Snickerdoodles are 0.22$ each and chocolate chip are 0.43$ each

Step-by-step explanation:

using the information in the problem, you can make 2 separate equations: 8x+12y=6.92 and 5x+5y=3.25, let x= the cost of a snickerdoodle and y= the cost of a chocolate chip cookie.

With the 2 equations, we can isolate the y variable of the first equation and simplify which will give us y= -2/3x +6.92/12.

You can now take that equation and plug it into equation number 2:

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solve that equation by multiplying 5 through the brackets: 5x-10/3x+34.6/12=3.25

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find the value of x, you will get x=0.22

plug the value of x (0.22) into one of your equations and solve for the y-value

8 0
3 years ago
The sum of 4 consecutive numbers is 926. Find the four numbers​
Kisachek [45]

Answer:231.5

Step-by-step explanation:

If you divide 926 by 4 you will get 231.5

6 0
3 years ago
Help me with Thursday ASAP please
MrRissso [65]

Answer:

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Step-by-step explanation:

Kim's age is always three more than Tom's age.

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Find the value of n such that x^2-19x n is a perfect square trinomial.
Marianna [84]
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