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Tresset [83]
2 years ago
12

Refer to your Expeditions in Reading book for a complete version of this text.

Mathematics
1 answer:
ahrayia [7]2 years ago
6 0

Answer:

The 3rd one, The 1st one and The last one.

Step-by-step explanation:

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if 300 jellybeans cost you x dollars. how many jellybeans can you purchase for 50 cents at the same rate?
Furkat [3]
It is 125 jelly beans
5 0
3 years ago
A washer and a dryer cost $1039 combined. The washer costs $89 more than the dryer. What is the cost of the dryer?
Maru [420]

Answer:

475

1039 - 89 = 950

950  \div 2 = 475

7 0
3 years ago
Read 2 more answers
1.) Solve x - 9 = -12<br>-) Solve 2t + 7 = -1​
Harlamova29_29 [7]

Answer:

1)x=3

2)t=-4

Step-by-step explanation:

x-9=-12

x=3

2t=-8

t=-4

8 0
3 years ago
Read 2 more answers
Need an answer for question 7 HURRY PLEASE 20 POINTS
Andrei [34K]

Answer:

2x^2 = 6x - 5.

-x^2 - 10x = 34.

These have only complex roots/

Step-by-step explanation:

3x^2 - 5x = -8

3x^2 - 5x + 8 = 0

There are complex roots if the discriminant  9b^2 - 4ac) is negative.

Here the discriminant D = (-5)^2 - 4*-5*8 = 25 + 160

This is positive so the roots are real.

2x^2 = 6x - 5

2x^2 - 6x + 5 = 0

D = (-6)^2 - 4*2*5 =  36 - 40 = -4

So this has no real roots only complex ones.

12x = 9x^2 + 4

9x^2 - 12x + 4 = 0

D = (-12)^2 - 4*9 * 4 = 144 - 144 = 0.

- Real roots.

-x^2 - 10x = 34

x^2 + 10x + 34 = 0

D = (10)^2 - 4*1*34 = 100 - 136 = -36.

No real roots = only complex roots.

7 0
3 years ago
The question is below​
Cloud [144]

Answer:

See below.

Step-by-step explanation:

a.

The first figure has 1 square. The second figure has a column of 2 squares added to the left. The third figure has a column of 3 squares added to the left. Each new figure has a column of squares added to the left containing the same number of squares as the number of the figure.

b.

Figure 10 has 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 squares.

c.

The formula for adding n positive integers starting at 1 is:

1 + 2 + 3 + ... + n = n(n + 1)/2

For figure 55, n = 55.

n(n + 1)/2 = 55(56)/2 = 1540

d.

Let's use the formula set equal to 190 and solve for n. If n is an integer, then we can.

n(n + 1)/2 = 190

n(n + 1) = 380

We know that 380 = 19 * 20, so n = 19.

Answer: yes

e.

Use the formula above,

S = n(n + 1)/2, where S is the sum.

f.

n(n + 1) = 1478

38 * 39 = 1482

37 * 38 = 1406

3 0
3 years ago
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