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Serggg [28]
2 years ago
10

#21 please I need help

Mathematics
1 answer:
deff fn [24]2 years ago
5 0

Answer:

12y/5

Step-by-step explanation:

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A city has 5 new houses for every 7 old houses. If there are 45 new houses in the city, how many old houses are there?
torisob [31]

Answer:

63

Step-by-step explanation:

Make a ratio:

5 : 7 = 45 : x

x = 63

6 0
3 years ago
If the discriminant is negative then the quadratic has
zepelin [54]

Answer:

No <em>real</em> solutions (or has two complex roots)

Step-by-step explanation:

The discriminant, <em>b</em>² - 4<em>ac</em>, is the expression (<u><em>radicand </em></u>) of the quadratic equation:

x = \frac{-b +/- \sqrt{b^{2}-4ac} }{2a}.

The value of the discriminant determines the <u>nature</u> and the <u>number of solutions</u> given by the quadratic equation.

A discriminant with a negative value (or b² - 4ac < 0 ) means that the quadratic equation has no real solutions or two complex solutions. Quadratic equations with a negative discriminant also have no x-intercepts; thus, its graph will not cross the x-axis.  

4 0
3 years ago
Which polygons can be mapped onto each other by similarity transformations? A. polygons 1 and 4 B. polygons 1 and 3 C. polygons
Yuri [45]

The answer is D.polygons 1 and 2

7 0
3 years ago
Read 2 more answers
Can someone help me out with this at all?
dsp73

Answer:

1 maps to 1

2 maps to 3

3 maps to 2

Step-by-step explanation:

the correctly assigned answer options describe everything.

there is not much else to say and explain.

these are all true statements due to the symmetry principle of a circle.

when 2 direct connections of two points on the circumference of a circle have the same length, then also their bent distances on the circumference of the circle are the same. and vice versa.

and yes, the perpendicular radius (or diameter) of the circle towards such a line cuts this line in half.

6 0
3 years ago
Find the possible values of s in the inequality 12s-20 &lt;3s-25
GaryK [48]

12s - 20 < 3s - 25 |+20

12s < 3s - 5 |-3s

9s < -5 |:9

s < -5/9

Answer: Any number from the set (-∞, -5/9).

7 0
3 years ago
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