Round the following numbers to 1 decimal place
a) 27.564
b)978.299
c)42.935
d)8.99
please help!!

a) 27.6

b) 978.3

c)42.9

d) 9

Step-by-step explanation:

If the hundredths place is 5 or higher round the tenths place up one. If it is .99 go round up the ones place.

a) 27.6 b) 978.3 c) 42.9 d) 9

Step-by-step explanation:

Look at the decimal in the tenths place (next to the decimal point) and round it up or down according to the decimal in the hundredths place, which is on the right. If the decimal in the hundredths place is 5 or higher, the tenths place rises 1. If it is lower than 5, it lowers one.

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15