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enot [183]
3 years ago
7

Find f(-3). f(x) = 4x + 7

Mathematics
1 answer:
solong [7]3 years ago
3 0

Answer:

f(x) = 4x + 7

f(x) = 4(-3) + 7

f(x) = -12 + 7

f(x) = 5

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Donna sells pencils for $2 and pens $3. She sold 11 items and made $30. How many pens did she sell ?
finlep [7]

Donna sold 3 pencils and 8 pens solved using simultaneous equation

What is a simultaneous equation?

Simultaneous equation refers to related equations that are solved at the same to derive answers to the unknown variables

Let assume that X pencils were sold and Y pens were sold

The total revenue is the sum of the prices multiplied by the quantities sold.

2X+3Y=30   (equation 1)

The sum of X and Y sold is 11

X+Y=11   (equation 2)

multiply the second equation by 2

2*(X+Y=11)

2X+2Y=22 (equation 3)

subtract equation 3 from 1

(2X+3Y=30)-(2X+2Y=22)

Y=8

Substitute for Y in equation 2

X+8=11

X=11-8

X=3

Which means he sold 3 pencils and 8 pens.

Find details on simultaneous equation in the link below:

brainly.com/question/20627346

#SPJ1

4 0
2 years ago
Pamela owns 15 T-shirts, 3 of which are yellow.
Bumek [7]
3/15 is the probability
6 0
2 years ago
Need help with this. <br><br> A B C D
patriot [66]

Answer:

yes, it is a right triangle and ∡Q is the right angle

Step-by-step explanation:

if the slope of QR is the opposite reciprocal of QS then the two segments are perpendicular and form a 90° angle

slope of QR:  -3 - (-1) ÷ 2 - 0  = -2 ÷ 2 = -1

slope of QS:  -3 - (-1) ÷ 2 - 4  = -2 ÷ -2 = 1

-1 and 1 are opposite and reciprocal so m∡Q = 90°

8 0
2 years ago
Y = (1/4)x^2 - (1/2)lnx..over the interval (1, 7e) ...what is the arc length ?
xenn [34]
So, f[x] = 1/4x^2 - 1/2Ln(x) 
<span>thus f'[x] = 1/4*2x - 1/2*(1/x) = x/2 - 1/2x </span>
<span>thus f'[x]^2 = (x^2)/4 - 2*(x/2)*(1/2x) + 1/(4x^2) = (x^2)/4 - 1/2 + 1/(4x^2) </span>
<span>thus f'[x]^2 + 1 = (x^2)/4 + 1/2 + 1/(4x^2) = (x/2 + 1/2x)^2 </span>
<span>thus Sqrt[...] = (x/2 + 1/2x) </span>
6 0
3 years ago
Does any know this answer
vichka [17]
F(n) = 75*1/5n

This is because the base value would be 75 and it is divided by 5 each part of the sequence. 
5 0
3 years ago
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