Help me with this!! I dont understand this question

Mathematics

1 answer:

Sonja [21]3 years ago

4 0

Answer:

the answer would be c

Step-by-step explanation: Because the values inside of the parenthesis don't have the same variable, they cannot be combined. Using the 9 on the outside of the parenthesis you would multiply 9 by 3r, which gives you 27r, and 9 by -4 to create -36. The new equation would be 27r - 36, which is equivalent to the equation shown next to it.

You might be interested in

Serggg [28]

Answer:

B. 252

Step-by-step explanation:

To find the answer, you have to use the formula to calculate the number of combinations as in this case, the order in which the objects are selected doesn't matter:

nCr=n!/r!(n-r)!

n= number of sample points: 10

r= number of sample points in each combination: 5

10C5= 10!/5!(10-5)!

10C5= 10!/5!*5!

10C5= 252

According to this, the answer is that you have 252 different ways to choose your school lunch.

5 0

4 years ago

The Long family and the Harris family each used their sprinklers last summer. The water output rate for the Long family's sprink

horrorfan [7]

Answer:

Step-by-step explanation:

Given

Rate of Long family's sprinkler is 25 L/hr

rate of Harris family's sprinkler is 35 L/hr

Total time for which sprinkler is used =55 hr

Let long family run their sprinkler for x hr

therefore Harris family time=55-x

Total volume collected=1625 L

thus

$25\times x+35\times (55-x)=1625$

25x+1925-35x=1625

1925-1625=10x

300=10x

x=30 hr

long family used for 30 hr and Harris family used for 20 hr

4 0

3 years ago

MAKING BRAINLIEST!!! Need help with problem

Inessa05 [86]

Answer:

15cdm $units$ ²

Step-by-step explanation:

The formula for the area of a rectangle is $length*width$ so you would multiply together the length and the width given. I added a drawing because it was the easiest way for me to write it out: