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2 years ago

Solve for x. 7(x-3) = 4(x+5)

Mathematics

2 answers:

anyanavicka [17]2 years ago

7 0

Answer:

x = 41/3 or 43 over 3

Step-by-step explanation:

7x -21= 4(x+5)

7x -4x-21=20

3x=20+21

x= 41/3 or 43 over 3

azamat2 years ago

6 0

Answer:

x = 13.67

Step-by-step explanation:

7(x-3) = 4(x+5) or, 7x - 21 = 4x + 20 or, 7x - 4x = 20+21 or, 3x = 41 or, x = 41/3 or, x = 13.67

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A quadrilateral can be constructed with four obtuse angles. <br> True<br> False

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2 years ago

Which three lengths could be the lengths of the sides of a triangle?

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9, 15, 22.

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3 years ago

Read 2 more answers

Paul and Charlene are 420 miles apart. They start toward each other with Paul driving 16 mph faster than Charlene. They meet in

Thepotemich [5.8K]

Answer:

34 mph.

Step-by-step explanation:

Let x be speed of Charlene, then speed of Paul will be x+16 as we are given that Paul is driving 16 mph faster than Charlene.

Let y be distance covered by Charlene, then distance covered by Paul will be 420-y.

Now we will use formula $\text{Speed}=\frac{\text{Distance}}{\text{Time}}$ . Upon using our given information we will get two equation and two unknowns as:

$x+16=\frac{420-y}{5}...(1)$

$x=\frac{y}{5}...(2)$

Upon substituting $x=\frac{y}{5}$ in 1st equation we will get,

$\frac{y}{5}+16=\frac{420-y}{5}$

Upon multiplying both sides of our equation by 5 we will get,

$5(\frac{y}{5}+16)=420-y$

$5\times\frac{y}{5}+5\times 16=420-y$

$y+80=420-y$

$y+80+y=420-y+y$

$2y+80=420$

$2y=420-80$

$2y=340$

$y=\frac{340}{2}$

$y=170$

Upon substituting y=170 in 2nd equation we will get,

$x=\frac{170}{5}$

$x=34$

Therefore, Charlene's speed is 34 miles per hour.

6 0

3 years ago

I do not have the energy to do this, someone help please?

matrenka [14]

Separate into two groups
y^3(5y+4) + 5(5y+4)
(y^3 + 5)(5y + 4)

8 0

2 years ago

Bailey bought a lawnmower for $600. The value of the lawnmower depreciates 2% every year. What is the value of the lawnmower aft

givi [52]

Answer:

$542

Step-by-step explanation:

we know that

The equation of a exponential decay function is given by

$y=a(1-r)^x$

where

y is the value of the lawnmower

x is the time in years

a is the initial value

r is the rate of change

we have

$a=\$600\\r=2\%=2/100=0.02$

substitute

$y=600(1-0.02)^x$

$y=600(0.98)^x$

For x=5 years

$y=600(0.98)^5=\$542$

8 0

3 years ago