3 years ago

Please help and explain work

Mathematics

1 answer:

bazaltina [42]3 years ago

8 0

Answer:

i'm not sure

Step-by-step explanation:

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Please help me with this problem. I am not sure if I am correct.

jek_recluse [69]

Answer:

only -7

Step-by-step explanation:

Just plug them in.

so for x=-7 $\sqrt{-2(-7)-5}=(-7)+4\\\sqrt{9}=-3 \\ 3=-3$ So this one is extraneous

Then if you plug -3 in you get 1 = 1 so this one is not extraneous. if you need me to work this one out let me know.

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4 years ago

If (a, –5) is a solution to the equation 3a = –2b – 7, what is a?

sukhopar [10]

Answer:

d) 1

Step-by-step explanation:

3a = –2b – 7

We have the point (a, -5) so b = -5

Substituting in

3a = -2(-5) -7

3a = 10-7

3a = 3

Divide each side by 3

3a/3 = 3/3

a =1

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3 years ago

In which of the following intervals does the trigonometric inequality csc(x)> -sec(x) always hold true?

Kaylis [27]

Answer:a is the answer

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3 years ago

What is the average rate of change of the function over the interval x = 0 to x = 5?

AURORKA [14]

$\bf slope = m = \cfrac{rise}{run} \implies \cfrac{ f(x_2) - f(x_1)}{ x_2 - x_1}\impliedby \begin{array}{llll} average~rate\\ of~change \end{array}\\\\[-0.35em] \rule{34em}{0.25pt}\\\\ f(x)= 2x^2-1\qquad \begin{cases} x_1=0\\ x_2=5 \end{cases}\implies \cfrac{f(5)-f(0)}{5-0} \\\\\\ \cfrac{[2(5)^2-1]~~-~~[2(0)^2-1]}{5}\implies \cfrac{50-(-1)}{5}\implies \cfrac{50+1}{5}\implies \cfrac{51}{5}\implies 10\frac{1}{5}$

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3 years ago

Jessa bought 15 pieces of ribbon. Each piece of ribbon was 2.25 yards long. What is the total amount of ribbon Jessa bought? ent

algol [13]

Hello,

15 pieces of ribbon, each is 2.25 yards long.
15 x 2.25 = 33.75 yards of ribbon.

Hope this helped!

3 0

4 years ago

Read 2 more answers