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3 years ago

THIS IS 1 QUESTION YEAR 9 MATHS PLEASE HELP ME

Mathematics

2 answers:

Katyanochek1 [597]3 years ago

5 0

I think it’s B and D

natka813 [3]3 years ago

5 0

The two shapes with rotational symmetry are B and D

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Which relation represents a function?

trasher [3.6K]

Answer:

(-2, 2), (0, 2), (7, 2), (11, 2)

Step-by-step explanation:

A relation must have no repeating x-values for it to be a function.

Set C does not have any repeating x-values, so it is a function.

Sets A, B, and D have repeating x-values, so they are not functions.

A: (0, 0), (2, 3), (2, 5), (6, 6)

B: (3, 5), (8, 4), (10, 11), (10, 6)

D: (13, 2), (13, 3), (13, 4), (13, 5)

4 0

3 years ago

Read 2 more answers

Please solve this problem.

just olya [345]

x=number of oranges.

y=number of bananas.

we can suggest this system of equations:

x+y=12

0.5x+0.25y=5

We can solve this system of equations by substitution method.

x=12-y

0.5(12-y)+0.25y=5

6-0.5y+0.25y=5

-0.25y=5-6

-0.25y=-1

y=-1 /- 0.25=4

x=12-y

x=12-4=8

Answer:

<em>Tanya bought 8 oranges and 4 bananas.</em>

4 0

2 years ago

Read 2 more answers

3=x+3-5x what is the awnser

Nezavi [6.7K]

I know we aren’t suppose to promote other websites but photomath will scan these questions and give you an explanation quicker than live ppl answering them. Or tiger algebra or math papa all of these are great for solving algebra problems :)

8 0

2 years ago

How do you do this i totaly forgot.

vagabundo [1.1K]

Step-by-step explanation:

7^2+8^2=113

Then square root 113 which is 10.63 to 2.d.p

So x=10.63

5 0

3 years ago

The population of algae in an

mezya [45]

The equation is y = 20(1.40)^x

where x is the number of days and y is the future amount after x days go by

The 1.40 is from the fact that 1+r = 1+0.40 = 1.40, where r is the decimal form of 40%, so r = 0.40

-----------------------------

Plug in x = 7 to get

y = 20(1.40)^x

y = 20(1.40)^7

y = 210.827008

y = 211

We round to the nearest whole number since it doesn't make much sense to have a fractional portion of an algae. After 7 days, there are about <u>211</u> algae.

5 0

3 years ago