MATHEMATICS HIGH SCHOOL

Explain how to find 40x50 using mental math

Answers

Answer 1
Answer: Bscically DO 4x5 which is 20
NEXT add the two zeros
NOW you have 2,000
40x50=2,000 
Answer 2
Answer:

First, do 4*5=20

Then, add two zeros...

So the answer is 2000

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enrollment in a photography class increased from 25 to 35 students. What was the percent of increase in enrollment?

Answers

Answer

40%

Explanation

A parentage value is a value that has been compared to 100.

Percentage = (change in the value)/(the original value) × 100%

                   = (35-25)/25 × 100%

                    = 10/25 × 100%

                   = 40%
(35-25)/25x100%
=40%
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Circle R has a radius of 6, and is tangent to circle R at point Q. Also, QP = 8. (a) What is the measure of angle RQP Explain your answer.
b) What is the length of RP Explain your answer.
(c) What is the length of RS Explain your answer.
(d) What is the length of RP Explain your answer.

Answers

I found the image that is part of this problem.

Circle R has a radius of 6. The radius is from R to Q, edge of the circle. Another radius is formed from R to S.

Radius R to Q is the short leg of a right triangle. It measures 6 cm.
a) The measure of the angle RQP is 90°. It is a right triangle.
b) The length of RP is 10 cm.
RP is the hypotenuse.
a² + b² = c²
6² + 8² = c²
36 + 64  = 100
c² = 100
√c² = √100
c = 10 cm

c.) the length of RS is 6 cm. It is also a radius. 
d) The length of RP is 10 cm. Same answer as scenario b.

120 books increased by 55%

Answers

Simplest way to do this:
 number of books= 120
 percentage represented by 120= 100%
 increase current percent by 55%= 155%

: . 55% increase = original number of books * (155%)
                           = 120 * (155/100)
                           = 186

What is y=6x-4 in standard form

Answers

Answer:

6x-y=4 in standard form.

Step-by-step explanation:

Answer:

-6x+y=-4

Step-by-step explanation:

subtract 6x from both sides

What should be added to 4c (– a + b + c) to obtain
3a (a + b + c) – 2b(a – b + c)?

Answers

Step-by-step explanation:

here hope it is helpful

the writing is not mine so yeah

Find the length of BC.
A)8
B)12
C)16
D)18

Answers

Answer:

i think its A (edit: im gonna take that back because i was looking at the wrong side, logically it is 12)

Step-by-step explanation:

Answer:

B. 12

Step-by-step explanation:

logically speaking is 12
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