Find the value of the expression 4a to the fourth power - 2b squared +40 when a =2 and b=7

Answers

Answer 1

Answer: 4a^4 -2b^2 +40
a=2
b=7
4(2)^4 -2(7)^2 +40
PEMDAS is what your gonna use to solve this you go from right to left

First is P which is parentheses which is none
second is E which stands for exponents
4(32)-2(49)+40
now MD multiply or divide
128-98+40
now add or subtract
30+40
last one
70 this is your answer i hope

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uses long wavelength energy in the electromagnetic spectrum to reflect waves to a receiver and form images from space

Answers

Step-by-step explanation:

Since the last reflecting off glass

Andy is scuba diving.He starts at sea level and then descends 10 feet in 2 1/2 minutes. a. how would you represent Andy's descend as a unit rate? Express your answer as an integer.
b. How much feet can he descend in 6 minutes?

Answers

Descent = 10 feet
Time required = 2 1/2 minutes.
The rate of descent = (10 feet)/(2.5 mn) = 4 ft/min

In 6 minutes, the descent will be
(4 ft/min)*(6 min) = 24 ft

Answer:
(a) 4 feet/minute
(b) 24 feet

PLEASE HURRY According to a poll, 30% of voters support a ballot initiative. Hans randomly surveys 5 voters. What is the probability that exactly 2 voters will be in favor of the ballot initiative? Round the answer to the nearest thousandth.P (k successes) = Subscript n Baseline C Subscript k Baseline p Superscript k Baseline (1 minus p) Superscript n minus k. Subscript n Baseline C Subscript k Baseline = StartFraction n factorial Over (n minus k) factorial times k factorial EndFraction

0.024

0.031

0.132

0.309

Answers

Answer:

0.309

Step-by-step explanation:

→ Utilise the binomial distribution formula

$p=nCr*p^(n) *q^(n-r)$

→ It first will be 5C2 as there is 5 possible voters but he wants 2 voters

$p=5C2*p^(n) *q^(n-r)$

→ Then it will be $0.3^(2)$ as the probability they are in favour is 0.3 and we get the n from the 2 number for the 5C2

$p=5C2*0.3^(2) *q^(n-r)$

→ There for q will be 0.7 as it is the other probability left and the power will be 3 as it is n - r

$p=5C2*0.3^(2) *0.7^(3)$

→ Then getting 0.3087 which is 0.309

Answer:

Option D) 0.309

Step-by-step explanation:

Correct on edge

a rectangle has a length that is nine feet less than four times its width. Its area is 90 ft. Algebraically determine the length of its width and length. Show work

Answers

Ok... after much confusion, I've come to the conclusion that you must have written the question wrong and it's actually the perimeter that is 90 feet so that's how I'm going to work it...

Width = w
Length = 4w - 9

P = 2w x 2L
90 = 2w + 2(4w - 9)
90 = 2w + 8w - 18
90 = 10w - 18
108 = 10w
108/10 = w
10 4/5 = w

Width is 10 4/5 ft

Length = 4w - 9
L = 4(10 4/5) - 9
L = 43 1/5 - 9
L = 34 1/5 ft

Length 34 1/5 ft Width 10 4/5 ft or
Length 34.2 ft and width 10.8 ft

A system of equation is shown y=-2x+b
y= 3x+b
What value of b is required so that the system has the solution (0,6)
b=
Please no link I need help badly!