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kati45 [8]
3 years ago
8

Please help me with this please!!!!!!

Mathematics
2 answers:
Masteriza [31]3 years ago
8 0
Best Answer: Look at the discriminant of the quadratic equations to find the number and type of solutions. The discriminant is part of the quadratic formula underneath the square root sign: b^2 - 4ac. If it is positive, then there are two real solutions for that quadratic equation. If the discriminant is 0, then there is one real solution. If the discriminant is positive, then there are two imaginary solutions.

1.) x^2 - 18 = 0
a = 1, b = 0, c = -18

b^2 - 4ac
(0)^2 - 4(1)(-18)
72

ANSWER: 2 real solutions

2.) x^2 + 5x + 7 = 0
a = 1, b = 5, c = 7

b^2 - 4ac
(5)^2 - 4(1)(7)
25 - 28
-3

ANSWER: 0 real solutions


Hope this helps
ASHA 777 [7]3 years ago
7 0
The value of the  discriminant b^2 - 4ac will tell you this :-

it =  5^2 - 4*1*7 = -3

which is negative 
Therfore there are no real number solutions

B
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If angle ABC is one degree less than three times angle ABD and angle DBC=47 find each measure
Contact [7]

It has not been indicated whether the figure in the questions is a triangle or a quadrilateral. Irrespective of the shape, this can be solved. The two possible shapes and angles have been indicated in the attached image.

Now, from the information given we can infer that there is a line BD that cuts angle ABC in two parts: angle ABD and angle DBC

⇒ Angle ABC = Angle ABD + Angle DBC

Also, we know that angle ABC is 1 degree less than 3 times the angle ABD, and that angle DBC is 47 degree

Let angle ABD be x

⇒ Angle ABC = 3x-1

Also, Angle ABC = Angle ABD + Angle DBC

Substituting the values in the above equations

⇒ 3x-1 = x+47

⇒ 2x = 48

⇒ x = 24

So angle ABD = 24 degree, and angle ABC = 3(24)-1 = 71-1 = 71 degree

8 0
3 years ago
On the 1st of January 2014, Carol invested some money in a bank account. The account pays 2.5% compound interest per year. On th
cluponka [151]
She started with x.
After 1 year, she had 1.025x.
She withdrew <span>£1000, so now she has 1.025x - 1000.
Then it earned interest for 1 year and ended up as </span>1.025(1.025x - 1000).
The actual amount of money was £23 517.60.
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<span>1.025(1.025x - 1000) = 23517.60

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Her original deposit was </span><span>£23 360</span>
5 0
3 years ago
Lynn has a box of crayons.
Scrat [10]

Answer:

<em>There are 72 crayons in the box</em>

Step-by-step explanation:

<u>Fractions</u>

To solve this problem we'll manage numbers as fractions to keep the precision up to the end of it.

Lynn has a box of crayons. It's given 4/9 of the crayons are blue. The remaining crayons are:

1-\frac{4}{9}=\frac{5}{9}

From that portion, 65% are red, or equivalently, 35% are yellow.

We write 35% as a fraction:

\displaystyle 35\%=\frac{35}{100}=\frac{7}{20}

Thus, the portion of yellow crayons is:

\displaystyle \frac{7}{20}\cdot \frac{5}{9}=\frac{7}{36}

This fraction of x crayons is equal to 14, thus:

\displaystyle x=\frac{14}{\frac{7}{36}}=14\cdot\frac{36}{7}

x = 72

There are 72 crayons in the box

7 0
2 years ago
A particular fruit's weights are normally distributed, with a mean of 774 grams and a standard deviation of 31 grams.
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Step-by-step explanation:

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7 0
3 years ago
Please help me still bad at ratio :)
Sholpan [36]

Answer:

111 grams

Step-by-step explanation:

fruit: yoghurt: total

2    : 3           :  2+3=5

The total mass is 185

Divide 185/5 = 37

Multiply each number by 37

fruit: yoghurt: total

2*37    : 3 *37  : 5*37

74            111         185

The mass of the yoghurt is 111

3 0
3 years ago
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