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bezimeni [28]
3 years ago
14

Please help, will mark Brainly and if you need help with anything I’ll help with any work you send

Mathematics
1 answer:
inessss [21]3 years ago
6 0

Answer:

The first one is missing (d - 9) so it would be 5(d -9) or when you factor it out 5d - 45

In the second one (d + 7) is missing so it will be 8d(d + 7) so if you factor that out you will receive 8d^2 + 56

Step-by-step explanation:

3d^2 + 18d -21 =(3d -3)( d + 7)

3d^2 -30d +27 =(3d -3)(d - 9)

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34 is what percent of 80?
Fofino [41]

Answer:

42.5%

Step-by-step explanation:

6 0
3 years ago
COSINE LAW: Solve triangle PQR. round angles to the nearest tenth​
Valentin [98]

Answer:

Hi,

Step-by-step explanation:

PR²=PQ²+QR²-2*PQ*QR*cos(51°)

=15²+12²-2*15*12*cos(51°)

=142,444659....

PR=11.9350...

PQ²=QR²+PR²-2*QR*PR*cos(R)

cos(R)=(12²+142.444...-15²)/(2*12*11.9350...)=0,21451112....

angle R=77,61315...°≈77.6°

angle P=180°-51°-77.6°≈51,4°

4 0
2 years ago
A farmer feeds her four horses 64 bales of hay each week. How many bales of hay would the farmer need in order to feed six horse
jekas [21]

Answer:

96 bales

Step-by-step explanation:

\frac{64}{4} = \frac{x}{6}

You must multiply 6 by 64, which is 384.

Then you divide that by 4, which is 96.

Therefore, the answer is 96.

Also, I lined up the bales in the same row and horses in the same row, so this way can help. It can also help if it's in the same column though, but I hope this helped you!

5 0
3 years ago
Read 2 more answers
A teacher is experimenting with computer-based instruction. In which situation could the teacher use a hypothesis test for a pop
kvv77 [185]

Answer:

Step-by-step explanation:

The situation is a case of matched or paired samples since the samples are dependent. The two measurements are drawn from the same pair of individuals The parameter that is tested using matched pairs is the population mean and this is what teacher intends to use a hypothesis test for.

The correct option is

A) She gives each student a pretest. Then she teaches a lesson using a computer program. Afterwards, she gives each student a post test. The teacher wants to see if the difference in scores will show an improvement.

5 0
3 years ago
I don’t understand question 8 a and b. Could someone please explain?
Dima020 [189]

Answer:

The answer is totaly A bevause it says in the paper right there and exd

3 0
4 years ago
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