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Gemiola [76]
4 years ago
11

Evaluate 3x−4 when x=7.

Mathematics
2 answers:
Free_Kalibri [48]4 years ago
8 0

Answer:

17

Step-by-step explanation:

3(7)-4=17

Goshia [24]4 years ago
4 0

Answer:

It is 17

Step-by-step explanation:

Simplify the expression.

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At the bank, Derek made 7 withdrawals, each in the same amount. His brother, John, made 5 withdrawals,
denis-greek [22]

At the bank, Derek made 7 withdrawals, each in the same amount. His brother, John, made 5 withdrawls, each in the same amount.

Let x be  the amount of one of Derek's withdrawals

Each of John's withdrawals was $5 more than each withdrawal that Derek made.

x + 5 is t the amount of one of John's withdrawals

Derek made 7 withdrawals

So amount withdraw 7 times = 7x

John made 5 withdrawals

So amount withdraw 5 times = 5(x+5)

Both Derek and John withdrew the same amount of money in the end

(A)7x = 5(x+5)

(B) Solve for x

7x = 5x + 25

Subtract 5x from both sides

2x = 25

Divide by 2

x = 12.5

(C) check your solution

we plug in 12.5 for x in 7x= 5x + 25

7(12.5) = 5(12.5) + 25

87.5 = 62.5+ 25

87.5 = 87.5

(D) Each brother withdrawal 87.5 dollars


5 0
3 years ago
A company has 10 trucks. A truck has 15 pallets. A pallet has 7 boxes. A box has 50 containers. A container has 3 plastic bags.
Oliga [24]

Step-by-step explanation:

5160 In two trucks they have a 50 specimen , 10 , 20

6 0
2 years ago
What is the value of Y ?
gtnhenbr [62]

Answer:

y=7

Step-by-step explanation:

Since y "b" of the triangle is x and the hypotenuse is 2x, you can divide 14 by 2 and get 7, the answer.

7 0
3 years ago
Verify identities Will give BRAINLIST do not give me trash!!
lilavasa [31]

Answer:

See proof below

Step-by-step explanation

cot^2(x) - csc^2(x) = -1

In trigonometry identity

cot^2x = cos²x/sin²x

Csc²x = 1/sin²x

Substitute into the original expression

cos²x/sin²x - 1/sin²x

Find the LCM

(Cos²x-1)/sin²x .... *

Recall that sin²x+cos²x = 1

Sin²x = 1-cos²x

-sin²x = -1+cos²x

-sin²x = cos²x-1 .... **

Substitute ** into *

(Cos²x-1)/sin²x

-sin²x/sin²x

= -1 (RHS)

Therefore cot^2(x) - csc^2(x) = -1 (Proved!)

8 0
3 years ago
Nathan is going to invest in an account paying an interest rate of 4.8% compounded continuously. How much would Nathan need to i
Elena-2011 [213]

Answer:

you would just 4.8 x how many years

Step-by-step explanation:

4 0
3 years ago
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