Answer:
(C)85.56 cm², 12.4 cm
Step-by-step explanation:
The Area of the screen of the new phone is :
19.68cm² + Area of the current phone screen size
The current phone screen size has dimensions: 6.1 cm and 10.8 cm,
Area of the current phone screen size = 6.1 cm × 10.8cm
Area of the current phone screen size = 65.88 cm²
Hence, The Area of the screen of the new phone is :
19.68cm² + Area of the current phone screen size
= 19.68cm² + 65.88cm²
= 85.56 cm²
The new phone screen must have an area of 85.56cm², which is the product of 6.9 cm and ___
The is calculated as:
85.56cm²/6.9cm
= 12.4cm
Therefore, the new phone screen must have an area of 85.56cm², which is the product of 6.9 cm and 12.4cm
Option C is correct
Answer:
x=-1 y= -5
Step-by-step explanation:
y = – x – 6
y = x – 4
Substitute into y = -x-6 into the second equation
y =x-4
-x-6 = x-4
Add x to each side
-x-6+x =x-4+x
-6 =2x-4
Add 4 to each side
-6+4 =2x-4+4
-2 = 2x
Divide by 2
-2/2 =2x/2
-1 = x
Now find y
y =-x-6
y = -(-1) -6
y =1-6
y = -5
Problem 1
Do you know what a complex number is? If you do not, you can get an answer but not one you will like much.
(3x)^2 + 27 = 0 remove the brackets. Remember to square what's inside the brackets.
9x^2 + 27 = 0 Divide both terms by 9
9x^2/9 + 27/9 = 0
x^2 + 3 = 0 Subtract 3 from both sides.
x^2 = -3 Take the square root from both sides.
x = sqrt(-3) but the square root of - 3 = 3i
x = i*sqrt(3)
Problem 2
x^ - 8x + 1 = 0
a = 1
b = - 8
c = 1
x = [- -8 +/- sqrt(b^2 - 4*a*c) ]/(2*a) Quadratic formula
x = [ 8 +/- sqrt( (-8)^2 - 4(1*1)]/2 Substitute Givens and combine
x = [ 8 +/- sqrt( 64 - 4 )] /2 Subtract 4
x = [ 8 +/- sqrt (60)]/2 Break 60 into 4 * 15
x = [ 8 +/- sqrt (4*15)]/2 Notice 4 is a perfect square. sqrt4 = 2
x = [ 8 +/- 2*sqrt(15)] / 2 Divide through by 2
x = 8/2 +/- sqrt (15)
x = 4 +/- sqrt(15) the twos were gone
8x+6+4= 3x- 2x- 4 is the correct step
Answer:
50mph
Step-by-step explanation:
250divided by 5 is equal to 5
