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Bogdan [553]
3 years ago
8

Sonia opened a savings account and then added the same amount to the savings account eyery week. After 5 weeks, her savings acco

unt had a total of $45. After 10 weeks, her savings account had a total of $70, Which equation represents the amount of money V.), in dollars, in Sonia's savings account after x weeks? y = 7x = y = 5x + 20 y = 20x + 5 ​
Mathematics
1 answer:
Goryan [66]3 years ago
7 0

Answer:

since Sonia saved 45$ in 5 weeks and 70$ in 10 weeks. we are to find the amount she saved up in x weeks.

let's make the amount y

so x= y

5 = 45 cross multiplying the values

we then have 45x= 5y

y= 7x

x=y

10=70

10x = 70y

y= 7x = y=5x+ 20, y = 20x+5

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3x+5y=-3 x-5y=-5 show your work
frez [133]
We are given the equations 3x+5y=-3 and x-5y=-5.

Both equations have a 5y  term which allows us to easily solve the system by elimination. To do so we will add the equations together like a simple addition problem by adding the x terms together, the y terms together, and the integer answers together.

3x + 5y = -3
+x - 5y = -5
---------------
4x + 0y = -8

The y terms cancel out since one is positive and one is negative. Now we can solve for x.

4x = -8

\frac{4x}{(4)} = \frac{-8}{(4)}

x = -2

Now plug -2 in for x in one of the original equations to find y.

(-2) - 5y = -5

-5y = -3

y = 3/5

Our answer as an ordered pair is (2, 3/5)
6 0
3 years ago
The price of a Graphing calculator is $80 the sales tax is 7%. What is the cost of the calculator
Elis [28]

Answer:

$85.60

Step-by-step explanation:

In this question, we need to find the price of the calculator after tax.

We know the cost of the calculator is $80 and the sales tax is 7%

To find your answer, we would multiply 80 by 1.07:

80 · 1.07 = 85.60

The total cost of the calculator is $85.60

4 0
3 years ago
12.......................
Nadusha1986 [10]

Answer:

A rational exponent is an exponent that is a fraction. If the fraction has an even denominator, the root will be of an even number (like the square root, the 4th root, etc.). Think about it when you square something: -2 • -2 = 4, 2 • 2 = 4. No matter the sign, any number multiplied by itself an even number of times will make a positive number. So, you can't take the square root of a negative number because it is impossible to get a negative number when squaring! This applies to ALL even roots/exponents. So, (-1)^½ does not exist! Look: (-1)^½ becomes √(-1) which is an imaginary number!

Step-by-step explanation:

3 0
3 years ago
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Aleksandr [31]

Answer:

if it rains 7 out of 10 days the chance of rain for one day is 70%

Step-by-step explanation:

8 0
3 years ago
Consider the following graph
DENIUS [597]

a) The equation of axis is the middle y-coordinate, which is y = -1.5.

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c) The amplitude is the vertical distance from an extreme point to the midpoint, which is 3.

d) This is a cosine graph since when x=0, y is not equal to 0.

7 0
2 years ago
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