Ask question

Ask question

All categories

2 years ago

10

Mary is doing research on bird migration. Last week she counted 12 migration birds in her yard. This week she counted 10. What w

as the percent decrease in birds this week?

1 answer:

Maksim231197 [3]2 years ago

3 0

16.67% decrease in birds per weeks

You might be interested in

Which best defines a circle?

Paraphin [41]

I believe the correct answer is A,

6 0

3 years ago

For a right triangle with legs a = 5 and b = 12, use the pythagorean theorem to find the hypotenuse,

kondor19780726 [428]

c = √(a²+b²)

c = √(5²+12²)

c = √(25+144)

c = √169

c = 13 units

7 0

2 years ago

Math question help pls

Ratling [72]

Answer:

B

........................

3 0

2 years ago

In an arithmetic sequence {an}, if a1 = 5 and d = 3, find a72. A) 216 B) 218 C) 221 D) 223

Phoenix [80]

The arithmetic sequence with the given condition is determined recursively by

$\begin{cases}a_1=5\\a_n=a_{n-1}+3&\text{for }n>1\end{cases}$

So we have

$a_2=a_1+3$

$a_3=a_2+3=a_1+3(2)$

$a_4=a_3+3=a_1+3(3)$

and so on with the general pattern

$a_n=a_1+3(n-1)$

This means the 72nd term in the sequence is

$a_{72}=a_1+3(72-1)=5+3(71)=218$

so the answer is B.

6 0

2 years ago

a farmer needs to buy fertilizer for his farmland. The instructions on the bag of fertilizer say 49.5 lb of fertilizer is needed

g100num [7]

Answer:

The farmer can cover approximately 40 acres of land with 2,000 pounds of fertilizer

Step-by-step explanation:

6 0

2 years ago