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leonid [27]
3 years ago
5

Question 3

Mathematics
1 answer:
REY [17]3 years ago
4 0
<span>Question 3 
Solve for d.

13d + 4 = 43
13d = 39
    d = 3

answer
A. 3

</span><span>Question 4 
Solve for r.

4r - 6 = 30
4r = 36
  r = 9

answer

D. 9
</span>

<span>Question 5 
Solve for u.

126 = 6u
u = 126/6
u = 21

answer

B. 21

</span>
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lana66690 [7]
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5 0
3 years ago
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The function f(x) = –x2 + 20x – 75 models the profit from one customer, in dollars, a shop makes for printing photos, where x is
trasher [3.6K]
The function is graphed as shown below

Part A:

We use the formula - \frac{b}{2a} to find the vertex of the function. A quadratic function of the form of a x^{2} +bx+c and equating this form to the given function - x^{2} +20x-75, we have
b=20 and a=-1.

Substituting a and b into the vertex formula, we have
x=- \frac{20}{2(-1)}=10, as shown in the graph

This calculation means that the highest profit is achieved when the number of photo printed equals to ten photos

Part B:

We can find solution to this equation by factorising

- x^{2} +20x-75=0
-( x^{2} -20x+75)=0
x^{2} -20x+75=0
(x-5)(x-15)=0
x=5 and x=15, as shown in the graph

The two values means that the company makes no profit when they either produce 5 or 15 photos

8 0
3 years ago
Simplify. 24÷(–8–(–4))<br> a. –6<br> b. –2<br> c. 2<br> d. 6
yawa3891 [41]
(by order of operation, you do the parantheses first)

24÷(–8–(–4))    [-8-(-4) = -8+4 = -4)

24÷–4

- 6



The answer is A. -6


7 0
2 years ago
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How many apples are left in the tree if you started with 18 and ended with 11
ruslelena [56]

Answer:

Wouldn't it be 11? If the tree starts with 18 apples, and ends with 11, then that's it, it ends with 11 apples.

unless you just mis-typed, and meant 18-11. 7 would be the answer.

Step-by-step explanation:

7 0
3 years ago
Help! how would i work this out??
Alina [70]

Answer:

i can see it

Step-by-step explanation:

6 0
3 years ago
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