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Oxana [17]
2 years ago
5

Heelp i dont understand ;^;

Mathematics
1 answer:
alexira [117]2 years ago
6 0

Answer:

B?

Step-by-step explanation:

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Two stores are having a sale on T-shirts.Rose spends $63 for three T-shirts from store A and one from store B. Manny spends $140
Digiron [165]
Let a and b be store A and store B, respectively. Then:
3a+b=63
5a+4b=140
So
12a+4b=252
5a+4b=140
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2 years ago
A quadratic equation is shown below: 2x2 − 10x − 8 = 0 Part A: Describe the solution(s) to the equation by just determining the
dangina [55]
PART A:

The given quadratic equation is 2x²-10x-8=0

The radicand is given by b²-4ac where a, b, and c are the constants in a quadratic form ax²+bx+c

From the given equation, we have
a = 2
b = -10
c = -8

Radicand b²-4ac = (-10)² - 4(2)(-8) = 100 + 64 = 164

The radicand is >0 hence the quadratic equation has two distinct roots

PART B:

4x²-12x+5 = 0

We can use the factorization method to solve the equation
Firstly, we multiply 4 by 5 to get 20
Then we find the pair of numbers that multiply gives 20 and sum gives -12

The pair of number is -2 and -10
Rewriting the equation 
4x²-2x-10x+5 = 0
2x(2x-1)-5(2x-1) = 0
(2x-1)(2x-5) = 0

2x-1 = 0 and 2x-5 = 0
x = 1/2 and x = 5/2
6 0
3 years ago
Question 25 the sum of three numbers is 79 . the second number is 9 less than the first. the third number is 2 times the first.
g100num [7]
I believe the numbers are 22, 13, and 44.
4 0
3 years ago
A rectangle sandbox has an area of 64 square yards. What might be the perimeter of the sandbox?
zubka84 [21]

Answer:

32

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Select all ratios equivalent to 7:12.<br> 3:36, 49:84, 20:21, 10:30
aliina [53]
49:84 is the only one
6 0
3 years ago
Read 2 more answers
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