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3 years ago

Fill in the blank: 65 + ______ - 15 = 65

Mathematics

2 answers:

katrin2010 [14]3 years ago

7 0

Answer:

Step-by-step explanation:

65+15-15=65

SIZIF [17.4K]3 years ago

4 0

Answer:

65+15-15=65 can be the answer!!

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How many lines of symmetry does a trapezium have

OverLord2011 [107]

Answer:

Step-by-step explanation:

since the other side can not be given as a line of symentry

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3 years ago

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If y=-x+1 and y=3x+1, what is the numerical value of (3x+y)

sukhopar [10]

Add the 2 equations together

y = -x+1

y =3x+1

========

2y = 2x+2

divide by 2

y = x+1

y = -x+1

======= add these two equations together

2y = 2 divide by 2

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3 years ago

Find a value of k such that kx2 + 12x − 4 = 0 has one real-number solution. Explain.

Marta_Voda [28]

Answer: if x is to the 2 power then

kx^2+12x-4=0 Add 4 to the both sides

kx^2+12x=4 Divide both sides by 12

kx^2=1/3x square root the both sides

k=0.6x

Step-by-step explanation:

5 0

3 years ago

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PLEASE HELP ASAP!!!!!!!!

steposvetlana [31]

Answer:

4.6.

Step-by-step explanation:

The rocket hits the ground when h(t) = 0. So

$-16t^{2} + 72t + 7 = 0$

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

In this question:

$-16t^{2} + 72t + 7 = 0$

$a = -16, b = 72, c = 7$

Then

$\bigtriangleup = 72^{2} - 4*(-16)*7 = 5632$

$t_{1} = \frac{-72 + \sqrt{5632}}{2*(-16)} = -0.1$

$t_{2} = \frac{-72 - \sqrt{5632}}{2*(-16)} = 4.6$

Time is a positive measure, so the answer is 4.6.

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3 years ago

A rectangular prism has dimensions of 1/3, 3, and 5/3 in.

julsineya [31]

Answer:

Step-by-step explanation:

The rectangular prism has a volume equal to V=xyz. V=(1/3)3(5/3)=5/3 in^3. The cube has a volume equal to V=s^3. The volume of the cube is equal to the prism when

$s^3=(1/3)(3)(5/3)\\ \\ s^3=5/3\\ \\ s=\sqrt[3]{\frac{5}{3}}in\\ \\ s\approx 1.19in$

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3 years ago