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Leviafan [203]
3 years ago
11

What is the value of 7x squared + 2x when x = 3

Mathematics
1 answer:
Vadim26 [7]3 years ago
7 0

Answer:

The value of equation is 69   at x=3

Step-by-step explanation:

Given Equation:

        7x^2+2x

We have to find the value of the expression at x=3

Putting the value of 'x' in the given equation.

                 =7(3)^2+2(3)\\

                 =(7*9)+6\\63+6\\69

The value of the above expression at x=3 is 69.

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17 13/18 divided by 2 7/9
erik [133]

let's firstly convert the mixed fractions to improper fractions and then divide.

\bf \stackrel{mixed}{17\frac{13}{18}}\implies \cfrac{17\cdot 18 +13}{18}\implies \stackrel{improper}{\cfrac{319}{18}}~\hfill \stackrel{mixed}{2\frac{7}{9}}\implies \cfrac{2\cdot 9+7}{9}\implies \stackrel{improper}{\cfrac{25}{9}} \\\\[-0.35em] ~\dotfill

\bf \cfrac{319}{18}\div \cfrac{25}{9}\implies \cfrac{319}{\underset{2}{~~\begin{matrix} 18 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}}\cdot \cfrac{\stackrel{1}{~~\begin{matrix} 9 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}}{25}\implies \cfrac{319}{50}\implies 6\frac{19}{50}

7 0
3 years ago
Three children together have 50 toys,Harry has 10 less toys than Mark. Sue has twice as many toys as Harry. How many toys does e
Alexeev081 [22]

Answer:

Harry = 10 toys

Mark = 20 toys

Sue = 20 toys

Step-by-step explanation:

H + M + S = 50

H = M - 10

S = 2H

Harry = 10 toys

Mark = 20 toys

Sue = 20 toys

5 0
3 years ago
Prove that two non-zero vectors are collinear if and only if one vector is a scalar multiple of the other.
erastovalidia [21]

The Prove that two non-zero vectors are collinear if and only if one vector is a scalar multiple of the other is given below.

<h3>What are the proves?</h3>

1.  To know  collinear vectors:

∧ ⁻a ║ ⁻a

If  ⁻b = ∧ ⁻a

then |⁻b| = |∧ ⁻a|

So one can say that  line ⁻b and ⁻a are  collinear.

2.  If ⁻a and ⁻b  are collinear

Assuming |b| length  is  'μ' times of |⁻a |

Then | 'μ' ⁻a| = | 'μ' ⁻a|

So  ⁻b = 'μ' ⁻a

Learn more about vectors  from

brainly.com/question/25705666

#SPJ1

3 0
2 years ago
As an estimate we are told 5 miles is 8 km, what is 62.5 miles into km
Sati [7]

Answer:

≈100.5

Step-by-step explanation:

hope this helps

6 0
2 years ago
Nat sews a triangle on an apron. The three sides of the triangle measure 3 inches, 4 inches, and 5 inches. Which best represents
maria [59]

Answer:

Is a scalene right triangle

Step-by-step explanation:

Classify the triangle

By the interior angles

Applying the Pythagoras Theorem

c^{2}=a^{2} +b^{2}

substitute the values

5^{2}=3^{2} +4^{2}

25=25 ------> is true

therefore

Is a right triangle

By the length sides

The triangle has three unequal sides

therefore

Is a scalene triangle

4 0
3 years ago
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