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3 years ago

Evaluate the expression 2x + 5 when x = 4

Mathematics

2 answers:

Korolek [52]3 years ago

5 0

Answer:

= 2(4) + 5

= 8 + 5

= 13

kykrilka [37]3 years ago

3 0

Answer:

x= 4 /7

Step-by-step explanation:

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Need help plz very much

andrew-mc [135]

Answer:

Step-by-step explanation:

Remember that when we are dividing two exponents with the same base (here, it's 13), we can subtract the values of the powers:

$\frac{a^m}{a^n} =a^{m-n}$

So, here, we have $\frac{13^{10}}{13^7}$ , so we subtract 7 from 10:

$\frac{13^{10}}{13^7}=13^{10-7}=13^3$

Thus, 3 should go in the box.

6 0

3 years ago

HELP!!!!!!!!!!!!!!!!!!!!!!!!!! Can U Answer All These.

mash [69]

QUESTION 1

In figure A, the area of the bigger square is $625\:units^2$ . This means that the length of this square is the hypotenuse of the right angle triangle formed, which is $25\:units$ .

The area of the two smaller squares are $576\:units^2$ and $49\:units^2$ .

The length of these two squares form the two shorter legs of the right angle triangle, which are $24$ and $7$ units respectively.

Therefore we can write the equation, $576+49=625$ .

This implies that, $24^2+7^2=25^2$

We can see that the sum of the squares of the two shorter legs equals the square of the longer side which is the hypotenuse and this what the Pythagoras theorem says.

But in fig. B,

$5^2+4^2\ne 6^2$

Therefore the correct answer is Fig A.

QUESTION 2

See diagram.

We introduce the two lines as shown in the diagram.

From Pythagoras' Theorem,

$|AB|^2=|AC|^2+|BC|^2$

But $|AC|=|7-3|=4$ units.

and

$|BC|=|8-2|=6$ units.

This implies that,

$|AB|^2=4^2+6^2$

$|AB|^2=16+36$

$|AB|^2=52$

$|AB|=\sqrt{52}$

$|AB|=2\sqrt{13}$

$|AB|=7.2$ to the nearest tenth.

QUESTION 3

The numbers $3,4$ and $5$ form a Pythagorean triplet because $3^2+4^2=5^2$ .

If these numbers represent the side lengths of a triangular fence, then the triangular fence must be a right angle triangle.

The correct answer is B

Yes,because $3^2+4^2=5^2$ .

QUESTION 4

See graph.

We want to find the image of the triangle with vertices A(-5,-4), B(-2,-4), and C(-5,-1) after a reflection in the x-axis.

The mapping for this transformation is

$P(x,y)\rightarrow P'(x,-y)$ .

We just have to negate the y-coordinates.

$A(-4,-5)\rightarrow A'(-4,5)$ .

$B(-4,-1)\rightarrow B'(-4,1)$ .

$C(-5,-1)\rightarrow C'(-5,1)$ .

3 0

4 years ago

derek solved 1400 math problems in 70days .if Derek solved the same number of math problems each say,how many math problems did

Licemer1 [7]

Answer: the answer would be 20

Step-by-step explanation: The answer 20 is from 1400 divided by 70 making 20, if you take 1400 and turn it into 14 then 70 into 7 then divide 14 by 7 you get 2 now just add a zero to your answer.

4 0

3 years ago

Round rhis number to the nearest thousand 3,842,532

deff fn [24]

Rounding to nearest 10: 3,842,530

Rounding to nearest 1,000:3,843,532

3 0

3 years ago

Read 2 more answers

On a coordinate plane, DEF has vertices D(1,2), E(7,2)and F(1,9). What is the distance between point E and F?

notka56 [123]

Step-by-step explanation:

Using distance formula,