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ad-work [718]
3 years ago
10

Evaluate -a -8b when a = 9 and b = -3 someone please help quick!!

Mathematics
2 answers:
OverLord2011 [107]3 years ago
8 0

Answer:

15

Step-by-step explanation:

    -a -8b  

  so you replace  alphabets with the figures given

  =  -9 - 8(-3)

   when you multiply two negatives they give you a positive hence;

    = -9 +24

the answer is

    = 15

 

ollegr [7]3 years ago
4 0

Answer:

15

Step-by-step explanation:

-a -8b = -9 + 24 = 15

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Answer:

k = 11/3

Step-by-step explanation:

If the line is tangent to the curve, then Δ = 0.

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Remembering:

Δ>0 two different points of intersection x' \neqx''

Δ=0 one point of intersection x' = x''

Δ<0 two different points of intersection in the complex plan x' and -x'

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As the line and the curve have one point of intersection, which is (x, y), we can make a equality between them:

2x + k = 3x² + 4

0 = 3x² - 2x + (4 - k)

Now we can use the Δ=0 (Δ= b² - 4ac)

Δ = 0 = (-2)² - 4.3.(4-k)

0 = 4 - 48 + 12k

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2 years ago
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2 years ago
I NEED HELP PLEASE, THANKS! :) Heather invests $4,900 in an account with a 3.5% interest rate, making no other deposits or withd
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Answer:    $5,828.28

<u>Step-by-step explanation:</u>

Use the Compound Interest formula:     A=P(1+\frac{r}{n})^{nt}       where

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  • P is the principal (initial amount invested)
  • r is the interest rate (in decimal form)
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Given: P = 4,900

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           n = 2

           t = 5

A=4,900\bigg(1+\dfrac{0.035}{2}\bigg)^{2(5)}\\\\\\.\qquad = 4900(1.0175)^{10}\\\\\\.\qquad = \large\boxed{5,828.28}\\

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Step-by-step explanation:

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