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shtirl [24]
3 years ago
5

1. f(x) = x2 - 21 f(5)

Mathematics
1 answer:
matrenka [14]3 years ago
8 0

Answer:

x=13

Step-by-step explanation:

if you will substitute the value of f(x) with 5, you will get the following equation:

5=2x-21

2x=26/÷2

x=13

(I didn't know what you ment when you wrote x2, is it x square or 2X)

I really hope it was the second one, cause that's how I solved it.

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Bottles of sparkling water usually cost $1.69 each. This week they are in sale for 4 for $5. You bought one last week and one th
Phantasy [73]

Answer:

The cost of 1 sparkling bottle in this week is less than last week, so we pay less this week.

We pay $0.44 less this week.

Step-by-step explanation:

Given,

Cost of 1 sparkling bottle last week = $1.69

This week cost of 4 bottles is $5.

So we have to find the cost of 1 bottle.

For this we use the unitary method, we get the cost of 1 bottle;

Cost of 1 sparkling bottle this week = \frac{5}{4}=\$1.25

The cost of 1 sparkling bottle in this week is less than last week, so we pay less this week.

For finding how much we pay less this week, we have to subtract cost of 1 sparkling bottle this week from cost of 1 sparkling bottle last week.

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8 0
3 years ago
How do you Simplify this expression in algebra?<br><br> 9x + 2x (5 + 4) - 2(5x + 4x)
Minchanka [31]

One can solve this by first using order of operations, and then combining like terms.


First is parenthesis


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9x + 18x - 18x


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3 0
3 years ago
It takes Mike 60 minutes to vacuum a room, and Debbie 45 minutes.
elena55 [62]

Answer:

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Step-by-step explanation:

Explain question properly pls.

3 0
2 years ago
Hi please help i’ll give brain
Cloud [144]

Answer:

The GCF is going to be 30

Step-by-step explanation:

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The common factors are, 2, 3, and 5. We multiply those to get the GCF.

2 × 3 × 5 = 30

8 0
3 years ago
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vfiekz [6]
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3 years ago
Read 2 more answers
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