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3 years ago

1. Give the opposite of each number.

Mathematics

1 answer:

Sphinxa [80]3 years ago

4 0

Answer:

1. -3

2. 9

3. 5

4. -12

a 9-6=3

b.5-8=-3

c.-12-6=-18

d.10+8=18

e.+4-2=2

f.-9+5=-4

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On a shopping trip in Los Angeles, Rosaria Perez ordered 120 pieces of jewelry: a number of bracelets at $10 each and a numbe

Tomtit [17]

9514 1404 393

Answer:

50 bracelets
70 necklaces

Step-by-step explanation:

Let n represent the number of necklaces Rosaria ordered. Then the total cost of the order is ...

10(120 -n) +11(n) = 1270

n = 70 . . . . . . . . . . . . . simplify, subtract 1200

120 -70 = 50 . . . . . . . the number of bracelets

Rosaria purchased 70 necklaces and 50 bracelets.

8 0

3 years ago

Sean tossed a coin off a bridge into the stream below. The path of the coin can be represented by the equation 2 h tt = − 16t^2+

tekilochka [14]

Answer:

It will take 5.61 seconds for the coin to reach the stream.

Step-by-step explanation:

The height of the coin, after t seconds, is given by the following equation:

$h(t) = -16t^{2} + 72t + 100$

How long will it take the coin to reach the stream?

The stream is the ground level.

So the coin reaches the stream when h(t) = 0.

$h(t) = -16t^{2} + 72t + 100$

$-16t^{2} + 72t + 100 = 0$

Multiplying by (-1)

$16t^{2} - 72t - 100 = 0$

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:

$16t^{2} - 72t - 100 = 0$

$a = 16, b = -72, c = -100$

$\bigtriangleup = (-72)^{2} - 4*16*(-100) = 11584$

$t_{1} = \frac{-(-72) + \sqrt{11584}}{2*16} = 5.61$

$t_{2} = \frac{-(-72) - \sqrt{11584}}{2*16} = -1.11$

Time is a positive measure, so we take the positive value.

It will take 5.61 seconds for the coin to reach the stream.

3 0

3 years ago

7x+14<br> 2x2 + x-6<br> What is the GCF

fenix001 [56]

i will solve it first i need full form

6 0

2 years ago

Read 2 more answers

Solved i need the answer ASAP

makkiz [27]

Answer:

V = - 3

Step-by-step explanation:

$- 1 = \frac{1}{3} v \\ \\ - 1 \times 3 = v \\ \\ v = - 3$

Your answer is absolutely correct.

8 0

2 years ago

What are three ratios equivalent to 18:4

Blizzard [7]

Equivalent ratio means equal in value

18:4 = 9:2 = 36:8

7 0

2 years ago