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Naddika [18.5K]
3 years ago
7

Explain how to simplify this expression: (7a+ 9) + (4a – 7) in words.

Mathematics
1 answer:
Degger [83]3 years ago
4 0

Think of the letter 'a' to represent 1 apple.

a = 1a = 1 apple

2a = 2 apples

3a = 3 apples

and so on

Adding 7a with 4a means we have 7 apples and we add on 4 more. We'll have 7+4 = 11 apples total.

Algebraically we write 7a+4a = 11a to do this using shorthand.

The 9-7 portion is calculated like you'd expect and it simplifies to 2.

------------

Here's what the step by step picture looks like

(7a+9) + (4a-7)

7a + 9 + 4a - 7

(7a+4a) + (9-7)

11a + 2

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Please tell me the answer and explain
bezimeni [28]

Answer:

first box: 12

second box: 5.5

the boxes in chart in order is 12, 17.5, 23, 39.5

Step-by-step explanation:

I've done this before

7 0
3 years ago
S is the midpoint of RT. <br> If RS = 4x - 3 and RT = 6x - 4,<br> what’s the value of ST?
Georgia [21]

Answer:

R__S__T

RT = RS + ST

6x – 4 = ( 4x – 3) + ST

(6x – 4 ) – ( 4x – 3 ) = ST

(6x – 4 ) +( – 4x + 3 ) = ST

2x – 1 = ST

ST = 2x – 1

RS=ST

4x – 3 = 2x – 1

4x – 2x = – 1 +3

2x = 2

x= 2/2

x =1

ST = 2x – 1 = 2(1) – 1 =2 ‐ 1 = 1

ST = 1

I hope I helped you^_^

7 0
3 years ago
(Please answer, 100 points)
Ymorist [56]

use the formula 2πr

  • 106.76
  • 300.96
  • 2×3.14×(1/2)×39 = 122.46
  • 78.5

the c bit I did the whole process cuz the diameter is given and for the d bit i thought what you were trying to say is 25 diameter.

hope it helps and don't forget to put the units wherever necessary.!!!!

5 0
3 years ago
Keisha, Scott, and Ryan have a total of $101 in their wallets. Keisha has $6 more than Scott. Ryan has 3 times what Scott has. H
Yuri [45]

Answer:

Keisha =$25

Scott =$19

Ryan = $57

Step-by-step explanation:

Let the amount each have be represented by A, B and C

Keisha = A

Scott = B

Ryan = C

Keisha , Scott and Ryan have a total of $101.

That’s

A + B + C = $101

Keisha has $6 more than Scott

A = 6 + B

Ryan has 3 times Scott

C = 3B

Substitute 6+B for A and 3B for C in the first equation.

That’s

A + B + C = 101

6 + B + B + 3B = 101

6 + 5B = 101

Subtract 6 from both sides

6 - 6 + 5B = 101 - 6

5B = 95

Divide both sides by 5

B = 95/5

B = 19

Scott has $19

Recall Keisha has $6 more than Scott B.

That’s A = 6 + B

A = $6 + $19

A = $25

Keisha has $25

Also, Ryan C has 3 times what Scott B has .

That’s

C = 3 x B

C = 3 x 19

C = $57

Therefore, Keisha has $25, Scott has $19 and Ryan has $57

3 0
3 years ago
What factors do all the multiples of 5 have in common​
borishaifa [10]

Answer:

I think answer is 1..........

8 0
3 years ago
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