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crimeas [40]
3 years ago
10

- If 2x2 + 8y = 121.5 and x2 - 8y = 121.5, then x = 9 6.36 16 7

Mathematics
1 answer:
Natalija [7]3 years ago
4 0

Step-by-step explanation:

2x² + 8y = 121.5

x² - 8y = 121.5

Add the equations together to eliminate the y terms.

3x² = 243

x² = 81

x = 9

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What is the 28th term of the arithmetic sequence with a 1 = 4 and d= -2
Amiraneli [1.4K]

Answer:

Step-by-step explanation:

tn = a + (n-1)*d

t28 = 4 +   (27)*-2     27 because 27 = 28 - 1

t28  = 4 + - 54

t28 = 4 - 54

t28 = - 50      

4 0
3 years ago
Find the sum of 37, 9, 663, 1198, and 45<br>a. 1952<br>b. 1142<br>c. 942<br>d. 3952<br>e. 2722<br>​
frez [133]
The answer is 1952 because you have to add all of the numbers together
5 0
2 years ago
Read 2 more answers
Can someone please please help me :(
Readme [11.4K]

Answer:i think its 15 because if you take the km numbers and subtract them

Step-by-step explanation:

7 0
3 years ago
Two different families pay for entry into a water park.
icang [17]

Answer:

Adult ticket: $7

Child ticket: $2

Step-by-step explanation:

Set up a system of equations where a represents the cost of one adult ticket and c is the cost of one child ticket:

2a + 3c = 20

a + 4c = 15

Solve by elimination by multiplying the bottom equation by -2:

2a + 3c = 20

-2a -8c = -30

Add them together:

-5c = -10

c = 2

Now, we can plug in 2 as c to find the value of a:

2a + 3c = 20

2a + 3(2) = 20

2a + 6 = 20

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a = 7

6 0
3 years ago
Suppose your school costs for this term were $4780 and financial aid covered 3/4 of that amount. How much did financial aid cove
Alexandra [31]

Answer: Amount covered by financial aid=$3,585

Amount left that you have to pay =$1,195

Step-by-step explanation:

School cost for the term = $4780

Amount covered by financial aid = 3/4 of $4780

= 3/4 x 4780

Amount left that you have to pay=School cost for the term -Amount covered by financial aid

= $4,780 - $3,585

Amount left that you have to pay =$1,195

6 0
3 years ago
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