MATHEMATICS
MIDDLE SCHOOL

678 + 303 using mental math

Answer: Add 8+3=11

7+0=7

6+3=9

=981

7+0=7

6+3=9

=981

MIDDLE SCHOOL

Which equation can be used to find 40 percent of 25? 100x4 400

40x4 = 16

40x4

160

25x4 - 100

40-4 10

100-4 - 25

Answer:

Step-by-step explanation:

40%=0.4

0.4*25=10

COLLEGE

Biologists have noticed that the chirping rate of crickets of a certain species is related to temperature, and the relationship appears to be very nearly linear. A cricket produces 113 chirps per minute at 70°F and 173 chirps per minute at 80°F. (a) Find a linear equation that models the temperature T as a function of the number of chirps per minute N.

Answer:

Step-by-step explanation:

Basically the word problem here is trying to get us to find the line using the two points (113,70) and (173,80).

It also tells us by saying that we're modeling the temperature that we're going to be using the y = mx + b formula. m and b are what we'll mainly be looking for.

Let's start by finding m, the slope. We'll be using the point slope formula:

So m = 1/6.

Now let's use that m and choose one of the points (I chose (113,70) ) to plug in everything but b in the original formula

so now that we know our b and our m, we can plug those into the original equation to get our answer!

MIDDLE SCHOOL

Find the quotient of 226.84 round your answer to the nearest tenth

Answer: 226.8

Step-by-step explanation: Find the number in the tenth place 8 and look one place to the right for the rounding digit 4 . Round up if this number is greater than or equal to 5 and round down if it is less than 5 .

MIDDLE SCHOOL

Find the volume of the sphere 18 m

find the volume of the sister e27