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ohaa [14]
3 years ago
10

If f(x)=2x^2-10, find f(-3)

Mathematics
1 answer:
Maurinko [17]3 years ago
4 0

Answer:

f(- 3) = 8

Step-by-step explanation:

To evaluate f(- 3), substitute x = - 3 into f(x) , that is

f(- 3) = 2(- 3)² - 10 = 2(9) - 10 = 18 - 10 = 8

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Find the diagonal length of a rectangular TV screen with the a length of 25 inches and a width of 28 inches.
Luba_88 [7]

Answer:

37.5 inches

Step-by-step explanation:

Applying the Pythagorean Theorem,

a²+b²=c²

where c is the diagonal length

c=√(25²+28²)= 37.5

7 0
3 years ago
3(2x+14)divided by w-y if w=8,x=5,y=1 how do i solve this
Viktor [21]
\frac{3 (2x + 14)}{w - y}
w = 8, x = 5, y = 1

You have to first substitute every variable into its spot in the equation.

<span>\frac{3 (2x + 14)}{w-y}
</span><span>\frac{3 (2*5 + 14)}{8 - 1}
</span>
Then solve.

\frac{3 (28)}{7} = \frac{84}{7} = 12 
3 0
3 years ago
The simple interest earned by an account varies jointly as the time and the principal. In 2 years, a principal of $5000 earns $6
zheka24 [161]
1000*0.065=65 .................
7 0
3 years ago
Maya runs each lap in 5 minutes. She will run more than 45 minutes today. What are the possible numbers of laps she will run tod
Licemer1 [7]
<h3>The possible numbers of laps she will run today is greater than 9</h3>

<u>Solution:</u>

Given that,

Maya runs each lap in 5 minutes

Let "n" be the number of laps she will run today

She will run more than 45 minutes today

<u>Therefore, a inequality is framed as:</u>

n \times 5>45

5n>45\\\\Divide\ both\ sides\ by\ 5\\\\n>9

Thus the possible numbers of laps she will run today is greater than 9

5 0
3 years ago
10. Mary's father is four times as old as Mary. Five years ago he was seven times as old. How old
Harrizon [31]

Answer:

Mary is 10 years old, and her father is 40 years old.

Step-by-step explanation:

Let Mary's age = x.

Mary's father is four times as old, so he is 4x.

Five years ago, Mary was x - 5, and her father was 7(x - 5).

Five years ago, Mary's father was 4x - 5.

7(x - 5) = 4x - 5

7x - 35 = 4x - 5

3x = 30

x = 10

4x = 4 * 10 = 40

Mary is 10 years old, and her father is 40 years old.

7 0
3 years ago
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