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shtirl [24]
3 years ago
13

(-7) • (-5) what does it equal to

Mathematics
2 answers:
stepan [7]3 years ago
5 0

Answer:

35

Step-by-step explanation:

  1. Negative × negative = Positive
  2. -7 × -5 = 35

I hope this helps!

bixtya [17]3 years ago
5 0

Answer:

35

Step-by-step explanation:

Simplify

(-7) X (-5)

Negatives cancel out so its going to be positive

That's how you get 35.

You might be interested in
-2x+3y=-13 and 3x-3y=12
Tresset [83]

Answer:

x = -1 ,y = -5

Step-by-step explanation:

--> -2x + 3y +3x-3y = 12-13

--> x= -1

then

--> -2(-1) +3y =-13

--> 2+3y= -13

--> 3y = -15

--> y =-15/3

--> y = -5

3 0
3 years ago
Read 2 more answers
Three circles can intersect in?
abruzzese [7]

9514 1404 393

Answer:

  (a) two points

Step-by-step explanation:

The curve of a circle can only intersect another circle at a point or in an arc. The intersection will only be an arc if the circles have the same center and radius (are the same circle).

Different circles can only intersect each other at one or two points. Three different circles can intersect in one or two points. The 2-point case is shown in the attachment.

8 0
3 years ago
4x + -2 = 2x +4
iris [78.8K]
You do 4x — 2x which equals 2x then you do -2 —4 which equals -6 then you have 2x=-6. so you divide -6/2 and your answer is X=-3. Oh you check by replacing the Xs with -3 and see if the equation is true.
8 0
3 years ago
Read 2 more answers
What is the equation for y=-2+3 and y=1/3x-1?
Crank
So y=-2+3 means y=3-2
y=1

so then subsitute 1 for y and solve
1=1/3x-1
add 1 to both sides
2=1/3x
multiply boht sides by 3
6=x
so x=6
y=1
4 0
3 years ago
) Is it reasonable to compute a 95% confidence interval for π using the normal approximation in this case? If it is possible, ex
IRINA_888 [86]

Full Question:.

Most penguin species are not sexually dimorphic, which means they lack obvious outward body characteristics which indicate sex. Observation of behavior or a blood test can determine Penguin sex. A penguin researcher is interested in estimating the proportion of females in a large penguin population. She takes a random sample of n = 20 penguins and determines the sex of each one using a blood test. She finds 12 males and 8 females. Let π be the proportion of females in the population.

(a) Find a point estimate of π.

(b) Find the estimated standard deviation of your estimate.

(c) Is it reasonable to compute a 95% confidence interval for π using the normal approximation in this case? If it is possible, explain why, and make the interval. If it is not reasonable, explain why.

Answer:

a. The female penguins are 0.4 in proportion to the male.

b. Standard Error = 0.110

c. Yes, it is.

See Explanation

Step-by-step explanation:

Given

n = 20 penguins

m = Male = 12

f = Female = 8

π = the proportion of females in the population...

a. Calculating a point estimate of π.

This is calculated by dividing number of females by total penguins

π = f/n

π = 8/20

π = 0.4

So, the female penguins are 0.4 in proportion to the male.

b. Calculating Standard Error

Standard Error is calculated by √(pq/n)

Where p = 0.4 --- calculated above

q = 1 - p = 1 - 0.4

q = 0.6

n = 20

Standard Error = √(0.4*0.6/20).

Standard Error = 0.109544511501033

Standard Error = 0.110 -; Approximated

c. Checking Possibilities

Expected Value of Male = 20(0.6) = 12

Expected Value of Female = 20(0.4) = 8

20(0.4) and 20(0.6) are both greater than 5, so we can approximate the distribution as normal. The C sill be (0.18, 0.62).

7 0
3 years ago
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